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As unlikely as it may seem, the monitor is found to be the culprit in cases involving this problem even more than the GPU, which is why you simply must connect your computer to a different monitor and see if the problem persists. Connect the computer to a different monitor.

In addition, video cables are also incredibly inexpensive to replace. You could even switch to a different kind of connection (from DVI to HDMI or vice versa, for example) just to be absolutely sure.

That being the case, you should immediately replace the video cables – if your computer is connected to its monitor via DVI, get a new DVI cable, if it’s connected via HDMI, get a new HDMI cable. The cables that connect your computer to its monitor are responsible for transporting the video signals from your computer to its monitor, and fried/wasted cables can often result in the display resolution being downgraded and video output being lost altogether.

Replace the cables connecting the computer to its monitor.

The following are the two options you have when it comes to troubleshooting this problem, uncovering its true cause and trying to fix it: 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. However, what if, when the computer booted up, there was no video output and/or the monitor only rarely receives a video signal from the computer? What if your monitor wouldn’t display anything and would simply stay blank? The logical conclusion would obviously be that the computer’s GPU was trashed during use and can no longer support video output.

What would you do if you were using your computer and the display suddenly went all the way down to the 640X480 resolution (the lowest possible resolution on most computers)? Well, any sane person would assume that their computer is simply on the fritz and, in an attempt to sort the problem out, restart it.