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I kept my computer on but in sleep mode and went somewhere and when I returned, my monitor has a black screen and the CPU switch button's light was flashing.
I have an HP computer and Asus motherboard.
Move the mouse/press the keyboard. If that doesn't wake it up, press and release the power button on the computer. It should wake it.
My problem was solved — I just had to put the RAM into another RAM slot.
OK here's what you need to do: