Mac Pro monitor keeps flicking off then on.

I am currently having a problem with my monitor flicking off then on. Mainly while gamming but other times as well. Sort of looks like the energy saver is trying to put my monitor to sleep. Takes about a second for it to come back but is very annoying. several times after it comes back the current image on screen turns into a jigsaw with the pieces mixed up. i am currently using:
ATI Radeon HD 5870 1024 MB
Display Type:          LCD
  Resolution:          1920 x 1200
  Pixel Depth:          32-Bit Color (ARGB8888)
  Display Serial Number:          2A92715H0K0
The graphics card is new and i had this problem before with the apple card installed so know its not that.
I actually had this problem not long after i bought the computer from next byte but they could not replicate the problem so gave me the computer back.
Flicked off then on as i was typing this. Only programs that are running are safari and itunes.

System preferences > Desktop and ScreenSaver > Screensaver pane > ( Hot Corners) ...
... make certain all controls are set to Minus, to preclude accidental movement of the mouse in to a Hot Corner from activating the ScreenSaver and thereby momentarily blanking the screen.

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