I purchased a bondi iMac G3 300 (without firewire) for 25 bucks. Planned to get it running and give to someone who could use it. It starts up but after a half a min. it shuts down. I switched out the AV board with one that I knew would work but still the same thing. Changed out the crt and still the same thing. I'm wondering if it could be the power supply which is easy to relace and inexpensive compared to what I've done so far. I was just hoping that someone might know what else to try or confirm that I should replace the power supply or try something else in the mean time. Any responses would be appreciated.