Sometimes you will need to connect the second monitor to your machine. The procedure is really simple, you need to plug your cables to graphic card and monitor and enjoy working on your machine. Sometimes, it is not working well, because the second monitor is not detected by your machine. So what is the reason? There are different reasons including faulty cables, non-compatible drivers, and configuration issues. This issue occurs on different operating systems, different computers and notebooks and different monitors. We will show you how to fix the issue on operating systems from Windows 7 to Windows 10. If you want to use the second monitor, but you do not know where to start, please check instructions -> How to Setup Dual Monitors. We created 13 methods which will help you to solve the issue with your monitors.
Method 1: Change projection mode
If you properly connected your monitors to your graphic card, and you do not see anything on your second monitor, you will need to change projection mode, because your graphic card does not know what to do with the second monitor. We will show you how to change projection mode on Windows 10. This procedure is compatible with Windows 8 and Windows 8.1, too.
For Windows Vista and Windows 7, read instructions on this dual monitor setup.
Method 2: Restart your computer
If the first method did not solve your problem, we are recommending you to restart your machine. After that. After that hold Windows logo and press P to choose proper project mode (Windows 8, Windows 8.1 and Windows 10).
Method 3: Turn off computer, monitors, and cables
Let’s try the third step which helped users to solve their issue with the second monitor. In this method, you will need to turn off all devices and wait few minutes, and after that, you will need to turn on your devices again. Please check procedure below.
Method 4: Re-enable display adapters
Let’s try to do some software configuration. In this method, we will show you how to re-enable display adapter. Few users solved their problem by using this method. At first, you will need to disable your display adapter, and after that enable display adapter.
Method 5: Reinstall monitors
In this method, you will reinstall your monitors. We will show you how to do it using Windows 10 and monitor Samsung S24D59L.
Method 6: Rollback your drivers to the previous version
Did you update the driver for your graphic card and after that your machine is not detecting the second monitor? If yes, you will need to rollback driver of your graphic card. How will you do that? Please check instructions at this rollback drivers.
Method 7: Update graphic card driver
If you did not update your graphic driver, we are recommending you to update your driver with the latest driver version. You can do it using two ways. One is to update graphic card driver from Microsoft Update or you can download the official driver from vendor’s site. How will you do that? I wrote articles where I described the procedure of updating graphic card driver, which you can read on this video_tdr_failure nvlddmkm.sys, method 2. Based on that method, you will be able to find the proper driver for your graphic card.
Method 8: Change refresh rate
In this method, we will change monitor refresh rate. We will show you how to change frequency on Windows 10 using monitor Samsung S24D590L.
Method 9: Try some tricks
If you are using a notebook, we are recommending you to try some tricks.
Method 10: Turn on Multiple Display
If you installed the full driver for your NVIDIA and AMD graphic cards, you will need to run NVIDIA or AMD software to enable Multiple Display. We will show you how to turn on multiple displays using NVIDIA Control Panel.
Method 11: Update your BIOS
If you are using motherboard which supports integrated graphic cards with two ports, we are recommending you to update your BIOS of UEFI. We talk about updating BIOS or UEFI many times. To do an update of your BIOS or UEFI we are recommending you to check this https://appuals.com/fix-video_tdr_failure-nvlddmkm-sys/, method 15, where I described the procedure of updating BIOS on Asus motherboard.
Method 12: Revert your operating system to the previous version
If you are one of the users who updated machine from Windows 7, Windows 8 or Windows 8.1 to Windows 10, and after that, you can not use the second monitor, we are recommending you to revert your Windows to the previous version where everything worked properly. Why? Because your graphic card or graphic card driver is not properly compatible with Windows 10. You will need to wait for a proper update for your graphic card. Please do not use fix from third party websites.
Method 13: Check monitor, splitters, and cables
First, three methods did not solve your problem and you are waiting for best solutions. We are doing this step by step, so please be patient. In this method, you will test your monitor and cables which provide a connection between your computer or notebook and monitors. As we said at the beginning of this article, you can use VGA, DVI, HDMI and Display port. Let’s start with the testing monitor. If the first monitor is working without any problems, unplug the first monitor from computer or notebook and connect the second monitor to the same cable. But, if the second monitor does not support the same cable? In that case, use another cable and check the second monitor. If your monitor is not working on two different ports and two different ports, you will need to purchase another one monitor. If the second monitor is working on the first cable and not on the second cable, please change the cable. Also, if you are using VGA, DVI or HDMI splitter and there is an issue with splitter, you will need to change it by a new one.
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