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 ...
InnoSwitch™3-EP 1250 V ICs are the newest members of Power Integrations’ InnoSwitch family of off-line CV/CC QR flyback switcher ICs. The devices feature a 1250-volt PowiGaN™ GaN switch, positioning ...
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