Hello. My Deskpro 2000 started exhibiting an odd issue a couple of days ago. It would not power on. Thinking the (AT style) power supply died, I unplugged it and left the PC on the desk. This morning, I found my kid playing Jazz Jackrabbit on it. I thought to myself "ok, must have been a temporary issue witch sorted itself out, just old computer things"- but after being shut down (via the AT button), it would not power back on. Unplugging the PSU and letting the PC sit unplugged for 30 minutes or so, then plugging it back makes it turn on. So, to summarize:

- if left unplugged from the wall, the Deskpro 2000 will power on and work fine
- after powering it off via the power button, it will no longer turn back on. The power button is pushed in, but nothing happens.
- unplugging the PC and waiting for 20-30 minutes makes it power on again

What could cause this behavior? I suppose it's the PSU, but what inside it would cause it to not turn on? Especially considering the PSU is AT, not ATX?