Hey. I have agreed to look at my friends iMac G5. First problem was Blank screen - Nothing showing up, but when we shined a flashlight onto the screen we could see the desktop. = Backlight Inverter replaced. Still no joy = Continuous ON and OFF using PRAM reset for hours, then it came on worked fine. Next day we turned it back on - same problem. NOTES The chimes never appear to sound. The flashing white light doesnt always come on. The computer doesnt make a noise as if it were on. Please respond ASAP. Thanks.