I booted up my AIO G3 today and heard breaking glass. It was working fine Friday. I shut it down and now it boots up with a normal chime that warbles and there is no video signal. The screen is black. I removed the hard drive and reseated the ram. It will not boot from a CD. The symptoms are the same. Could it be the motherboard?
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PMac 7300 w/ Sonnet G4 400, BW G3 450, iMac DV 400, Lombard 400, Wallstreet II 266, Mystic G4 450 Dual, Sawtooth AGP with Sonnet 1GHZ

may be the personality card. it may have become loose. that would explain why you get no video.

Could be a lot of things. To see if it's something you could conceivably fix, systematically reseat everything that you can practically reseat (the personality card Bolle mentioned is a good one to include). There's also no substitute for a careful visual inspection. Blow out the dust and look closely at the motherboard and cards. Mystery smudges? Cracks in traces? Pram battery voltage? Leakage?

Measure the power supply voltages while you're at it. They should be within 5% of nominal. If any are significantly off from that, that's a clue right there.

Try booting with a minimum of parts (RAM, HD, etc). That will help narrow down the possibilities.

I reseated everything when it first happened except for the rom simm. I decided to try that and it worked. The AIO lives again.
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PMac 7300 w/ Sonnet G4 400, BW G3 450, iMac DV 400, Lombard 400, Wallstreet II 266, Mystic G4 450 Dual, Sawtooth AGP with Sonnet 1GHZ

those ROM simms have a tendency to wiggle loose in my experience. That is usually the first thing i check when im working on a non-booting beige.
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