My PowerMac G4 won't boot. When I press the power button, the fans and drive spin up, but the screen stays black, it doesn't chime, and it doesn't get to the grey apple splash screen. After about 10 seconds, the CPU fan will speed up to High. I have to unplug it to turn it off.
The problem started when the computer froze when waking up (not from sleep mode, more like Screen Saver mode on a Windows computer). It displayed the last screen, but nothing on the keyboard and mouse would work. So, I held the power button down to turn it off. When I pushed the button again to turn it on, that's when nothing happens.
I tried pushing the PMU reset button (unplugged first, pressed button, waited 10 seconds, plugged back in), but that didn't do anything. The battery is reading 3.6 volts (3.5-3.7 is the operating range). I also removed memory chips, incase one of them went bad. I'm not sure how to test if it is a graphics card problem, but I presume I would at least get a chime if the graphics card were defective.
If this was a Windows PC, I would describe the problem as PC not completing the POST (power on self test).
PowerMac G4. 1 GHZ, 1 GB RAM. AGP graphics card. It was running OS X 10.5.11 (Tiger).
