May I should whisper this but I've personally never had a PSU fail yet - even old cheap no-name things (like the one in my 386 from 1991 or the one in my 8088 from 1987) are still going strong.
I don't doubt failures happen and I've seen some from friends, colleagues and clients. Most of the time it has been due to a minor but critical manufacturing flaw rather than a failed component.
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Obsolescence is just a lack of imagination.
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