My screen went blank\black so I can't communicate with my computer

Gratefully, I followed jarotech's advice but that did not solve the problem, all cables were plugged in properly. But now I have a REAL CRISIS. In an effort to work on it, I probably hit some button that I shouldn't have and now the screen on my computer monitor itself went completely blank (black) and I can't communicate in any way with my computer. I think I may have just commanded the screen to go blank, but I don't know how to undo that since I can't see anytghing on my desktop (screen)at all, just blank. Turning the computer off and on doesn't help. Originally my problem was that I couldn't get anythingt to appear on a second screen, now I can't get anything to appear on either screen! Please help!
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