2008 Pro has flashes of black bar at bottom of screen

I'm getting flash of a black bar the full width of screen and height of dock at the very bottom of the screen.
It flashes quickly twice about every 10 seconds.
I just got the box last night.
It has an 8800GT card.
Didn't notice it last night, but left in on all night to format a hard drive with multiple passes.
I've rebooted and the condition persists.

Think I have a clue. I have two monitors connected to the 8800GT.
I had the card set to 'mirror mode' and I had my 2nd monitor turned off as I was attempting to clone my main hard drive, no need to burn the electricity.
When I turned on the 2nd monitor, the menu bar appeared 1/4 way down the screen, so the hole screen was pushed down by 1/4 and there was some garbage at the top of the screen.
I took it out of mirror mode with both monitors turned on, and the problem went away (I may have also rebooted).
Some driver issue with 8800GT.

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