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

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