the only thing I can think of is if the cable somehow thermal cycled in a weird way and the contacts are *only just* making contact so when plugged in it's showing 230V when unloaded but the contact resistance is high enough to tank the mains voltage as soon as it tries to power on? but then you'd think the PSU would hiccup rather than just not powering on (I guess maybe mains UVLO protection could prevent that or something? idk)
this is one of the weirdest failure cases I've ever had
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