My computer screen randomly shuts off

Hewlett-packard Pavilion media center m8...
January 17, 2011 at 11:43:38
Specs: Windows Vista
My computer screen randomly shuts off as I am using the computer. This is NOT at boot up. When I turn it back on there is just a black screen with my white cursor. I have to reboot sometimes to make it go away and the problem is solved until it happens again. Scanned with Anti-malewarebtes, avg pro, microsoft online scanner. All came back with nothing. Computer slows down right before the computer screen goes black again.

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January 17, 2011 at 11:47:17
So is the computer going into screensaver or are you actively using it when it happens? Does the black screen with white cursor happen on reboot (After you hold in the power button) or is this happening when screen goes dark?

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January 17, 2011 at 12:03:18
No this is happening as I am actively using the computer. No, this is not happening on reboot. The screen shuts off, the computer stays on and I turn the screen back on to find a black screen with only my white cursor visible that I can move around. I must reboot to get rid of the issue and it is gone, my computer is fine, but then my computer becomes slow for a while and it happens again a few hours later.

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