Need an assist for a legacy Mac - Power Mac G5 PPC Duo 2.0 Ghz. My display stops working as the operating tempature increases on my Mac. I've done the monitor swap. It ran great for 1 1/2 months. Now its flickering and going black. Everything that I've researced pints to the video card. Any recommendations for work arounds a/o replacement video cards are welcome. It has served nme well. It has more life to give. Thanks for the assist!