Dell 7480 ethernet not working. Oct 9, 2022 · Any standard M.
Dell 7480 ethernet not working Enter your service tag for tailored support articles. Jun 25, 2025 · This article is a guide to identifying and resolving problems with the Ethernet connection on a Dell laptop. I tried everything including install and uninstal Dell Touchpad drivers, BIOS update an Nov 19, 2020 · Latitude 7480 Mic not visible / not working Hello, I have a really annoying issue with my Dell Latitude 7480. IT says t Mar 25, 2017 · Fingerprint login is not working on Dell Latitude 7480 Hello, After installing Windows updates and Dell's updates, including the "Dell Data Protection" software, the fingerprint login option ceased working. Can't Pair or Connect to a Bluetooth Device in Windows: Facing Bluetooth issues like device not detected or pairing failure? Find out how to resolve these common problems. Learn how to fix Wi-Fi not working or a Dell laptop that won't connect. Long story short, some of these laptops are having ethernet connectivity issues. He works from home once a week. Find out how your chosen laptop stacks up against the competition and whether it's the one that best meets your expectations with the laptop comparison feature. I've tried s Jan 15, 2021 · Hi, we have DELL AIO 7480 devices which we would like to use with IGEL OS 11. For more information, see Dell Knowledge Base article Drivers and Downloads FAQs See this Dell Knowledge Base articles for troubleshooting MIPI cameras: Oct 22, 2021 · I need your support to resolve problem with Latitude 7480 laptop. This is my second inspiron laptop and I'm having the same problem I had with the previous one; Ethernet port doesn't work. Nov 20, 2017 · So a user’s 7480 lost all internet connectivity after Windows updates. If you have purchased a new Dell mobile broadband card upgrade kit, perform steps 3-6 to install the mobile broadband card, and then perform steps 1-2. An issue with the ethernet cable, port issues, ethernet driver issue, or some internal Windows settings could be the reasons why your Mar 24, 2025 · This package contains the Realtek USB GBE Ethernet Controller driver for Dell TB16, WD15, DS1000, TB18DC, WD19, WD22TB4, HD22Q series, WD25, and SD25 docks. I had been using the cellular network connection (intermittently) over the last month or so and this morning, for no apparent reason, the laptop no longer even recognises there is a SIM card there. Find information about drivers, setting up multiple monitors and troubleshooting steps to resolve common issues. Dell PC wifi not working. 2 slot with M-key instead. Downloads 108 Drivers, Utilities, Manual, Firmware and BIOS for Dell Latitude 7480 Notebooks & Tablet PCs. This tutorial will help you fix the following issues: Dell wifi not networks found. The settings menu has no option for Wi-Fi. 2 PCIe ethernet adapter connecting to M. I have tried everything in my power to make it work, even the dell support assist is not recognizing any problem, please help. The wifi option is gone, my laptop was connecting to wifi fine yesterday but now it can't connect to the internet, I've tried the troubleshooter and it didn't help, tried updating the wifi driver and the driver wont install, The laptop is Dell precision 7520 Aug 27, 2018 · We recently bought our CEO a Latitude 7490. 03Mbps down/10Mbps up. While Dell does not recommend you PXE boot through a dock connection, you can accomplish this using a USB Type-C to Ethernet dongle (such as Dell SKU# 470-ABND) to complete PXE boot. In the device manager, the Network Controller, PCI Data acquisition and Signal Processing Controller are not working even with the updates from Dell. Aug 11, 2015 · I just bought a Dell E7450 and having issues with Ethernet connection. Both with and without having the USB-C Dock or Network Interface Controller (NIC) adapter that is connected to their Dell laptop. Then, we’ll equip you with practical solutions, ensuring your Dell device remains seamlessly connected in the digital realm. Oct 9, 2022 · Any standard M. In this article, we’ll delve into the world of USB-C charging, explore the reasons behind this problem, and provide you with practical troubleshooting steps to get your laptop up and running. Jan 22, 2018 · I also had an ethernet cable stuck in the port of my Latitude 7480. exe), but gets: "This driver does not support your touchpad". I unplugged it and reconnected the cables on both ends 2 times and on the third hookup it recognized the battery. Update Intel I219-LM and Intel Rapid Storage Technology Driver and Management Console drivers to resolve issue with mapping to drive during Windows installation. Many users have reported this issue, and it’s essential to understand the possible causes and solutions. This firmware update manages the system touch screen functionality. Access self-help articles, troubleshooting guides, how-tos, and FAQs for your Latitude 7480. The Ethernet network driver helps the system to connect to a wired Internet connection. Feb 25, 2020 · HiWe have over 50 laptops latitude 7480,7490 and 7400 and we have a mix of different dock stations WD15, WD19 and D6000. May 8, 2017 · The Dell Latitude 14 7000 (7480) is a top-notch business laptop when configured with top-of-the-line components, though it is a bit more expensive than rivals when so equipped. They have worked for many people. Aug 11, 2017 · Latitude 7480 - Touchpad isn't working Hey, I'm running Win10 64b OS, and tried to install the appropriate driver (Dell-Touchpad-Driver_9HG8R_WIN_10. Before going further, check inside the system for the antenna leads necessary for the adapter -- if those are not present, you either need to consider a USB adapter instead, or will need to replace the display assembly in favor of one having the leads built into it. troubleshoot software and hardware issues to connect again. com Aug 26, 2025 · Windows platforms generally apply a generic driver that allows motherboards to recognize the Ethernet component. Can someone help me? See full list on support. Oct 15, 2018 · This package contains the Dell Touch Screen Firmware update utility. I'm having the same bluetooth issues; worked one day, not the next. And the intel ethernet drivers are missing, the onboard ethernet port doesn't work, nor will it recognize a USB wifi adapter. It looks like they’re not getting an IP from DHCP. When he uses it at home on his wireless, his download speeds are atrocious. please help. However, I have Windows 10, and I still can't find SIM card drivers and facing the same issue. Wifi connection is ok. You can do it! We show you how. e. Oct 22, 2021 · I need your support to resolve problem with Latitude 7480 laptop. Find step-by-step instructions to fix USB issues if a USB port is not working. When I connect Ethernet cable to laptop without docking station it works fine. It keeps connect and disconnect rapidly (it makes a high-pitched While Windows 11 supports a cellular network and has dedicated settings, the option may disappear due to misconfiguration or driver issues. Troubleshooting Dell laptop WI-FI wireless connectivity issues. Working with a G7 7588, using the Intel 9560AC WiFi card on Windows 11 home; this machine has VERY rarely given me any issues over the past 5 years. 2 card using a two-antenna setup will work fine, other than the ones requiring CNVio support (i. Cannot find Network/Service When I Run the Dell Mobile Broadband Card Utility, the Searching for Network Window Continuously Displays. This happens on the Dell WD19S, WD19DCS, and WD22TB4 docks. Nov 16, 2017 · Experiencing a strange issue with some of our Dell Latitude 5480s and 5580s. if i type normal (e. Learn how to address issues with your network adapter not appearing in the SupportAssist OS recovery menu. My wired network adapter card is not listed in the device manager. I have same situation with bluetooth. Wifi network appeared in Network connections, but not work. Oct 29, 2025 · Discover what Wake-on-LAN (WOL) is and how to troubleshoot it. 101. Jul 20, 2017 · This package contains the Intel I2xx/825xx Gigabit Ethernet Network Controller driver. Nov 9, 2021 · In my new Dell laptop, whenever I connect an ethernet cable it will disconnect from the internet for few seconds(5 sec) and reconnect immediately. Aug 21, 2023 · You do need a WWAN card in order to use a cell network. This issue started this week, I had to replace the keyboard inside since the enter key literally cracked in half, and the apostrophe key stopped working entirely. The network adapters are usually Get drivers and downloads for your Latitude 7480. Service manual here: Mar 18, 2024 · Users of Dell laptops such as the Dell Latitude E5450, E7440 and E7450 have reported running into a number of different issues after connecting their laptops to their docking stations and using them afterwards. Has anyone else encountered this issue? Specs: Dell Latitude Oct 15, 2021 · I have experienced similar issues with the ethernet connection where it tends to disconnect for about 5 seconds before reconnecting once in a while. microsoft. Apr 15, 2025 · This article provides information about how you can identify and resolve issues with the onboard wired Ethernet controller on a Dell Desktop. However, after booting to production Windows 11, the same adapter will not connect to the network. Unfortunatelly touchpad buttons don't work. Best Regards, David Jun 21, 2021 · My Dell Latitude 7440 will not power on without the power cord. This guide walks you through step-by-step instructions to troubleshoot and resolve Ethernet or LAN connection problems on your Dell device. If it does not work, you may consider to exchange it for an M. One of these issues is an Ethernet connection issue. Checking the issue I saw the docking usb network adapter is missing, along with other usb devices connected to the dock. Oct 12, 2020 · I got a new battery and cable, and when I installed it, it was not working, not being recognized. Jul 16, 2024 · HI, I have dell latitude E5470,the problem I am facing is that from last few days there is no wifi adapter showing in the device manager, the internet works when it is connected to ethernet, but wifi is not working. May 22, 2025 · Drivers for these docks do not load in a pre-Windows environment. ) Sep 12, 2021 · I installed Mint on my Dell Latitude 7480 laptop yesterday. 1 too). Fix Dell Laptop Wi-Fi is Not Working Problem in Windows 10/8/7 [2025]. Sep 29, 2008 · I'm having the same problem as VeronicaMy internet will now work through the ethernet portonly a USB. 2364, and 2 finger scroll (2fs) does work for browser and Office document scrolling, but I have a file explorer (=pre W10 windows explorer) window that the scroll will work for a while and then just stop scrolling. Oct 14, 2025 · How to Automatically Switch from Wireless to Wired Connections When Available by Hot Key or Intel Toolkit How to Disable a Wireless Network Connection When a Wired Connection is Detected Laptops Do Not Switch to Ethernet From WiFi When Plugged Into Ethernet Cable With USB-C Dongle After a few days I got complaints about the network disconnecting and no lan connection. The following article gives instructions on how to remove the Ethernet cable from Latitude and Vostro Ultrathin laptops. Sep 12, 2021 · I installed Mint on my Dell Latitude 7480 laptop yesterday. Get support for your Dell product with free diagnostic tests, drivers, downloads, how-to articles, videos, FAQs and community forums. Join this channel to get access to perks: / @fixsage Chapters: 00:00 Intro 00:39 Troubleshoot problems 02:06 Device manager How to fix common no internet connection available internet not working to troubleshoot fix your wireless internet connection in Windows 8 or Windows 8. having trouble with your dell touchpad buttons? check out this post for 5 effective solutions to get them working again and improve your user experience. Download and install the latest drivers, firmware and software for Windows devices. Apr 19, 2025 · BIOS settings to select to boot to an external device using USB TYPE-C connection for XPS, Precision, and Latitude laptops. Mar 25, 2017 · Fingerprint login is not working on Dell Latitude 7480 Hello, After installing Windows updates and Dell's updates, including the "Dell Data Protection" software, the fingerprint login option ceased working. Got any ideas? If the second device has connection issues, then the fault is with your router or network connection point. Learn the steps to enable WOL in the BIOS and optimize network adapter settings for seamless remote access. At the moment we have 40 devices which should be rollout and until end of year 110 devices. I can connect to the internet wirelessly but not with a wired connection. What basically happens is that when you plug in an ethernet cable, the device gets all the correct information from DHCP. IT says t Apr 19, 2024 · There are plenty of options you can try if your Dell touch screen is not working, such as running the built-in troubleshooter. It’s all of them, and for the life of me I don’t know why this is happening to our environment. Follow our guide to diagnose and troubleshoot this issue to minimize downtime and ensure your Dell system functionality. 2- Cable is new and carries speed of over 800MBps on other l Apr 30, 2024 · Find free step-by-step repair instructions, manuals, schematics, community support, and other DIY resources. The firmware has no network card driver for Intel (R) Ethernet Connection I219-LM. xx. Al We work with Dells for one of our clients, no issues at all. Check for good signal strength or contact the service provider. there is a yellow circle on this device in the Device Manager. (For example: Docking Stations and Monitors. g. This troubleshooting guide will help you Fix Dell Wi-Fi Not Working in Windows 10/8/7. Jul 15, 2020 · cellular network 'option' has completely disappeared! Hi there, I have a Dell Latitude that was working well up until this morning. I have a laptop that I believe has a malfunctioning usb-c port and wanted to get suggestions on what to do. I download the correct driver and reinstall it, but it seems not working. I tried everything including install and uninstal Dell Touchpad drivers, BIOS update an Apr 30, 2025 · Are you frustrated with your Dell laptop’s refusal to charge via USB-C? You’re not alone. Jul 13, 2025 · Wifi works, but ethernet is a no go. Repair information and troubleshooting for the Dell Latitude 7480, a 14" business-class laptop computer. Oct 14, 2025 · Learn how to troubleshoot touch screen issues on Dell laptops, All-In-One desktops, and monitors. I have been trying to download drivers online and move em over with a thumb drive and so far nothing is working. I have updated all drivers and firmware, rebooted, etc and swapped out both the monitor with a new one as well as the docking station. After checking the docking, testing another dell adapter and crossing with another laptop the problem comes surely from the 7420. See these Dell Knowledge Base articles for related information: Network Controller (network adapter) Troubleshooting and Usage How to Troubleshoot and Resolve any Wired network adapter issues with a Dell Latitude Computer Jun 19, 2025 · This article provides information about how to troubleshoot and resolve USB-related issues on your Dell computer. 7. However, network issues such as no connection, random disconnections, or slow speed can disrupt network connectivity. However, in order to make use of all network card (adapter) features, you must Nov 23, 2023 · In this blog, we’ll discuss the signs and potential causes of an Ethernet connection not working on Dell. ). Dec 7, 2023 · If your USB device isn't detected or recognized on your Dell PC, here are a few troubleshooting steps for you. Though, no Dell apps installed except Command Update. This article provides information about how you can identify and resolve issues with the onboard wired Ethernet controller on a Dell Desktop. As of 9/5/2025, I just installed Windows 11 Pro on my Dell 7480 and it is going strong. We would like to show you a description here but the site won’t allow us. Oct 21, 2025 · Dell Latitude 7440 can boot to PXE and connect to the network using a Dell USB-C to Ethernet dongle in WinPE. Got any ideas? This troubleshooting guide will help you Fix Dell Wi-Fi Not Working in Windows 10/8/7. All of them start acting up the past few weeks with ethernet not working on t May 21, 2021 · The Dell update to my intel HD Graphics 620 card driver disconnected the HDMI port, the Intel site driver update fixed it immediately after load and restart. I've been using it on my custom built desktop for about 6 months, so this was my second time installing it. all other drivers are working fine, and i have the latest Bios. Mar 26, 2020 · This one would likely do the job. Having trouble with your Thunderbolt dock? Get tips to fix connection and port issues and get your devices working again. Apr 16, 2025 · This article contains information about DisplayPort (DP) monitors connect to certain OptiPlex systems not showing video when turned on. - right click for properties - advanced Disable Energy efficient ethernet (and or green energy) and Wake on magic packet. May 9, 2013 · I would want to report a huge flaw in dell laptops. This issue occurred after Dell updates and attempt to see why Windows 11 won’t load on my Dell Inspiron 17 7779 laptop - although it meets all hardware requirements. If the second device connects to the network, then you should contact Dell Support to report a hardware fault. It is strange because at first it seems like a battery issue however I plug it in and it boots right up and the battery Feb 3, 2018 · Hello, I'd like to ask if i am the only one with some issues about the Latitude 7480 keyboard (bios 1. I can access the internet fine over an Ethernet cable but the wireless driver is showing as not present in settings. Nov 19, 2020 · Latitude 7480 Mic not visible / not working Hello, I have a really annoying issue with my Dell Latitude 7480. There could be several reasons behind the issue with ethernet not working on your PC. The Latitude 7400 isn't explicitly listed in the Compatibility tab, but the relatively recent Latitude 7480 is, and it's not uncommon for Dell not to update the Compatibility tab to include system models introduced after the accessory itself. I'm beginning to think the card is not working but how can I tell for sure? I can't even find how to replace it - I read it's part of the Jan 29, 2025 · Hello all, A while ago I instituted a block on Windows 11 24H2 because it was causing our network adapters to be disabled. Jul 5, 2018 · I tried an older machine with built in LAN and it works. I found a dell article and tried to replicate all these settings but it still doesn’t get past any check. If your Wifi Is connected to the internet but you have no internet or y Jul 6, 2023 · sim card suddenly not detected and give INSERT SIM its inside the tray it was working before perfectly so WWAN card is Installed already so can any one help me Nov 12, 2022 · While windows itself loads and works fine i am now missing the OEM drivers. Lately, after I changed my router and it stops working completely. Rule out a loose Ethernet port by shaking the network cable while it is still connected at both ends. Oct 23, 2012 · I have a Dell Latitude D600 laptop. Jul 22, 2025 · How to Implement PXE Booting from USB-C and Thunderbolt Ethernet Adapters Summary: Information about facilitating the Pre-Boot Execution (PXE) boot process when using a USB-C or Thunderbolt Ethernet adapter. 108_A00_02. You may be out of your service coverage area. I really hope someone from here will be able to help me or at least point me in the right direction. But when it is connected through Docking statio. Aug 28, 2025 · The following article provides information about the proper way to insert and remove the USB Type-C connector on Dell laptops and devices. 8. Resolve wired internet connection issues with tips for Ethernet setup, wire connectivity fixes, and improving Wired LAN performance. This is including if the Ethernet cable is sticking or is not coming out of the port. May 11, 2017 · I have a similar issue with my dell inspiron 7737 on which I'm running windows 10. Aug 15, 2021 · For anyone else with this issue disabling the following settings should work: Go to Device Manager, network adapters and find the ethernet one. In the network connections, I cannot see "Local area connection", only my wireless connection is working. When I plug it in to a WD19 dock it charges but will not display on my external monitor. Nov 26, 2023 · How did you install Windows 11 on Latitude 7480? I have the same device but it does not support Windows 11. I Have an Indication of Good Signal Strength but Cannot Connect. Dec 14, 2023 · Is your Ethernet not working in Windows 10 when you try to access the internet? Well, it is an issue that may occur out of the blue, and hamper your internet connectivity. I spent hours trying everything I could, including installing new drivers from dell's website and running windows 10. Aug 31, 2020 · I am experiencing this on Dell Latitude E5450 with W10 Pro, 21H2, 19044. I followed the suggestion of pushing the head a small screwdriver over the top of the cord release tab as I pressed it, and it finally released my cable. 1 Issues addressed in this tutorial: no If the second device has connection issues, then the fault is with your router or network connection point. Feb 7, 2025 · This article provides links to information regarding the use and troubleshooting of the network controller (network adapter) in your computer. Dec 19, 2019 · On my relatively new Inspiron 5570, I can't figure out how to get the Ethernet speed above 100 Mbps. So the server does work before I lost my mind on it. Access self-help articles, troubleshooting guides, how-tos, and FAQs for your OptiPlex 7480 All-In-One. Sep 3, 2025 · For help with troubleshooting Bluetooth issues and information about how to pair (connect) Dell Bluetooth enabled computers to Dell Bluetooth accessories, and steps to resolve issues you may see, see the sections below. Also used the dr Apr 30, 2025 · 5. Nov 15, 2024 · For testing, turn off the onboard NIC in BIOS settings. Im not sure where to start. Here's where you can download the newest software for your Latitude 7480. learn how to fix your dell laptop's wi-fi connectivity problem with these 6 methods. Troubleshoot Wi-Fi connection problems, including no Wi-Fi, slow speeds, and connectivity issues. Oct 13, 2025 · Learn how to setup, use, and troubleshoot Dell Thunderbolt Dock TB16. He's lucky to get 0. Jul 22, 2025 · The following article provides information about how to identify and resolve a wireless network issue on your Dell laptop or desktop with Ubuntu Linux installed. But when it is connected through Docking statio May 8, 2017 · The Dell Latitude 14 7000 (7480) is a top-notch business laptop when configured with top-of-the-line components, though it is a bit more expensive than rivals when so equipped. Oct 28, 2023 · If your Dell laptop is not connecting to WiFi properly, check this post for easy solutions to fix Dell laptop not connecting to WiFi! Aug 27, 2025 · Learn how to resolve common Internet connection issues on your Dell computer that matches the operating system. Apr 6, 2025 · This article provides information about determining the Pass-Though Media Access Control (MAC) address. Or speak with a Dell technical expert by phone or chat. The wired connection is the default in that instance. Also, my network adapter driver all of a sudden disappeared and I had to purchase a network USB to connect to the internet. The Wi-Fi has stopped working, the symbol to turn it on and off on the toolbar is non existent. Feb 19, 2021 · I totally agree. If your Wifi Is connected to the internet but you have no internet or y Nov 12, 2022 · While windows itself loads and works fine i am now missing the OEM drivers. The easiest way to identify if your computer has this feature is to check if this driver is listed under Camera on the Dell Drivers and Downloads site for your computer. You may not have an active subscription plan. In addition, I have a hard time getting it connecting to the ethernet at all, but it manages to work after a while. Everything was going smooth until one day the ethernet port suddenly stopped working, not even the lights turn on. , if Intel avoid the cards with a "1" in the model number -- such as AX201, AX211, etc. I’ve tried uninstalling and reinstalling the drivers, checking if it had anything to do with the ant-virus, and checked issues with any of the updates without any success. The machines I’m trying to get working are laptops with usb-c to ethernet. Jul 12, 2019 · The problem: I connect to the Internet (and to my local network) via an Ethernet cable. Follow step-by-step solutions for unresponsive, inaccurate, or intermittent touch functionality. It describes the setup and limitations and Static IP Address configuration requirements for managing docked laptops. Ethernet option is missing from the Newtork and Internet settings, and in device manager, under network adapters, Intel (R) Ethernet Connection (It might be also be relatek one, since it is missing I don't know which ethernet driver i had before) is also missing. Sep 3, 2019 · Upgraded to windows 10 32 bit. Stay connected with wired networking. The properties show "this device cannot start (code 10)". If you don't have an Ethernet cable for direct network connection, then for this part, you will need a different system to get the latest driver download from the Dell Support site, then transfer the file and do the install. If the second device has connection issues, then the fault is with your router or network connection point. The controller can be recognized by windows and it This article provides information about how you can identify and resolve issues with the onboard wired Ethernet controller on a Dell Desktop. We want to get everything situated for the update, but until a fix comes out I wanted to reach out and see if anyone else had this problem. 2207. However, when I wake my computer from Sleep mode, the computer is unable to connect with the Ethernet. I too am trying to set up a router that requires the ethernet connection. NOTE: If you have purchased a new Dell notebook equipped with a Dell mobile broadband card, perform steps 1-2 to activate your mobile broadband service. I am running Windows XP. Can’t even ping the default gateway, our AD servers Feb 7, 2015 · See these Dell Knowledge Base articles for related information: Network Controller (network adapter) Troubleshooting and Usage How to Troubleshoot and Resolve any Wired network adapter issues with a Dell Latitude Computer Aug 7, 2025 · Having Wi-Fi issues on Windows 10 or 11? Troubleshoot WiFi issues like cannot connect to this network, computer not connecting to WiFi, or wireless Internet not working. Complete technical specifications, details, expert ratings and review of Dell Latitude 7480. It has been checked with di Feb 2, 2019 · Dear Alan, Now Wifi device detecting (Dell Wireless 1560 802. Check that you have an active Dell Latitude 7480 Series Laptop Wifi Ethernet Not Working Problem #macnitesh #keyboardtricks #2025 Scopin · Kordhell 28 Dislike Jun 13, 2024 · The following article provides information about an Ethernet network problem on some of the Dell USB Type-C docks. 11ac), but not turning on. 1- Internet service of 1 gig. I'm very familiar with how to release the locking tab on an ethernet cable, but it would not work in this case. After working with Dell Support the only work around we found was not plugging the Ethernet cable directly into the dock and instead into the laptop (latitude 5480). Aug 6, 2025 · Believe it or not, an outdated driver can be the cause of your connection issues. 3, was the same with 1. No one at Dell seems to be of much assistance. I turned off my laptop, and came back again, and ethernet was not working Ethernet Connection Not Working in Windows: Prefer a wired connection? Learn how to troubleshoot common issues with internet connectivity when using an Ethernet connection. not very slowly) some keys are missed Mar 27, 2006 · problem: this network adapter cannot start. I don't think there is any potential hardware issue. Jun 21, 2022 · Just curious, is the Ethernet cable plugged in while you are trying to connect to WiFi? I ask because generally the default is that if the cable is connected the WiFi is not going to connect. After that though, there is zero network connectivity. 2- Cable is new and carries speed of over 800MBps on other l Repair information and troubleshooting for the Dell Latitude 7480, a 14" business-class laptop computer. cfvrcut iiyzvs ghjhjo urkc iyoj ghzl fmngxhfn nljndss ggawph qhetbb eps vsszigo jekuq ldfvny udfmmr