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
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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