However, that is not always the case. If your computer suddenly goes down to 640X480 resolution (or lower, in the case of computers that support lower resolutions) and you rarely see any video output or stop seeing any altogether upon rebooting, the problem does not necessarily lie with the GPU. The following are the two options you have when it comes to troubleshooting this problem, uncovering its true cause and trying to fix it:
Option 1: The software route
Quite a few users affected by this issue find themselves in this predicament simply because they have an MSCONFIG option known as Base video enabled on their computers. In such instances, simply disabling the Base video option resolves the problem. To disable the Base video option on your computer, you need to:
Option 2: The hardware route
If you find that the issue persists after replacing both the video cables and the monitor and the software route doesn’t work for you either, you can be entirely certain that the root of the problem is the GPU. In that case, you should see whether or not using a different GPU restores video output, and you should also have your GPU checked out.
Troubleshooting Xbox One Stuck in 640x480 ResolutionFIX: Windows 10 Cannot Change Screen ResolutionHow to Change Screen Resolution on Windows 10Cannot Change Screen Resolution in Windows 10
