Turns out it wasn't the power supply. It was the Powerleap upgrade. Took it out, reinstalled the original microprocessor and whoosh, the thing started up. Later swapped back to Powerleap. On the Powerleap, I adjusted the umpers for 100 FSB and 1.6 Volts on the other jumper. Got a few more freezes, but putting the old microprocessor in always got it to start up. Put Powerleap back in and everything is OK for now - so the power supply was fine, and now I have a spare.
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