I'm working on repairing a Power Mac G4 Sawtooth with an intermittant power-on issue. About half the time you power it on, it'll "bong," but it won't fire the monitor, and doesn't go any further from that. USB power is not supplied, as the caps-lock light doesn't come on to the keyboard.
no chimes of death, no random stuff, just power on issues. This mac also has a Sonnet 1Ghz G4 processor upgrade, and a couple of hard drives.
so far, I've disconnected all ATA devices, disconnected one bus, disconnected the other bus, and taken the whole works to bits, and put it back together, and haven't managed to fix it.
any ideas what would cause any intermittant problems like this? I'm sure I've forgotten some information, so ask questions, and I'll answer them