im having strange display issues with my powermac g5 its constantly flashing an refreshing the display every now and then after it wakes from sleep. similar to the way it would refresh if you change the screen res. please help!
PRAM stores things like video resolution and color settings. Try resetting the PRAM next time you reboot. Power it on and hold down Command+Option+P+R until you hear the computer chime 3x.