When you boot a computer and all you see is a black or blank screen with a blinking cursor (it may look like an underscore), it means the BIOS or UEFI is attempting to boot from a source other than ...
One of the more frustrating things that could go wrong is when your PC's screen won't turn on. You may find that your fan is working, but there is nothing on your display, or there is just no signal.
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