"k" wrote ..... > >If these are the 22-pin G4 PSUs you're looking for, if you find a >source that will sell you one without a broken one to exchange, >please tell me. k - No , not 22 or 24, the power supply in my G4/400 AGP has only a 20 pin connector. So we must be looking at totally different power supplies. I can't help you with the pin outs, sorry. The pin outs for my PS were shown in an article in the Apple Knowledge base which discussed diagnosing and replacing the power supply in G4's that showed no symptoms of life. You mention that Apple sells/refurbishes power supplies..... but for a high price. I haven't been able to find anything about that on the Apple site. The only place I've found ANY power supplies is at hardcoreMac, and they didn't have much available. Your speculations as to why they're hard to find are interesting... but repairing one can't be all that difficult and it seems that some entrepreneur somewhere MUST HAVE started up a little part-time business repairing them for a reasonable cost. But it'd still be nice if someone could give me a steer to a reliable source for these things. John