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Okay, I have another IIci logic board that turns on by itself and will not turn off via software. I have built a PSU extension cable so I am finally able to make measurements on the power on circuitry. As far as turn-on goes, on a known good logic board with the PSU plugged in UE13 pins 1...

I was an electronics technician in the Air Force back in the day, but it had been a long time since I'd done any electronics repair work when I became interested in retro computers a few years ago and began buying them to enjoy. I started with Ataris because that's what I had back in the 80's...

Hi everyone, glad to be here! I broke down last week and bought a (doubtless) over-priced Power Mac 6500/250 on eBay. It looked to be dirty (expected), but in decent condition. The description said "no HD," and when I received it today that was indeed true. It chimes and boots, but sits at...