Flashing Screen

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Sep 14, 2008
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Hi...I am new to the Mac and I have set up a dual monitor set up to edit photoshop. When my computer goes to sleep the main screen never goes to sleep, it just flashes red...green...blue...white....black....then over and over.
I have a Power Mac with 2x2 GHz Dual-Core Intel Xeon processors and I am using Dell 20" ultra sharp monitors.

Any help would be great
Thanks

PS...sorry if I am posting in the wrong area.
 

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