I'd guess you are looking at a cap failure in the original PSU. 386 era is what, early 90s. 30+ years is a good run. If a replacement PSU doesn't have a switch, you could always hook it to a surge ...
The title says it all. Lately when I hit the power button nothing happens. I have to cycle the PSU on/off switch once or twice and it miraculously boots. Sometimes I have to pull the PSU power cord ...
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