So I thought I'll unplug everything and maybe get a bong (no, not *that* bong!) but still nothing. Probably a dead battery. Searched and found OWC had cheap 4.5v units. Got the new battery, put it in, and everything is still dead. Front panel power button lights up and the fan spins but no video, no bong, no drives spin up. I'm thinking either the mobo is toast or at least the PS isn't up to snuff. I'm not intending to put any more money into this so I'm cannabalising the drives and maybe the 64 MB RAM sticks. There is also a Newer G3 400 L2 upgrade. So that's about it for the Supermac that I bought from Small Dog in 8/97. A good machine that hung tough and taught
A couple of years ago, I had what appeared to be a dead S900. Many symptoms were like the ones you've described and seemed to me at the time to point to the power supply. But what eventually got it going was to swap out my G3/500 upgrade for the original 604e. That, along with CUDA reset and zapping PRAM, got me rebooted. After that, I could reinstall the G3 and was able to boot.
It seems that some sort of low level reset can only be accomplished by the original CPU, but once done opens the way for any upgrade. If you haven't done so, I'd suggest you try swapping in the old CPU for a reboot try.
Good luck, Gary
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