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Try this experiment: Before trying to start computer, completely unplug it from AC power and count to 30. We have had a dozen Dells that would refuse to start -- would not respond to the ATX-->PSU signal, but they *would* start if we depowered long enough (to drain caps in the PSU, maybe??)

I'll try that the next time I need to boot it. For now we're just leaving the machine on, and I've ordered a replacement PSU.

One odd thing I noticed: from a state where the computer was completely unplugged, I could plug it in, wait a couple seconds, and if I then held the power button on the front for about five seconds, the little light on the bluetooth keyboard receiver would light up. It would light for about 10 seconds, then go off. About 15 minutes later the computer booted...