I haven't tried booting it without the battery, and since starting the diagnostics with the screen, simply because absolutely nothing happens e.g. CPU fan doesn't run UNLESS only the 4-pin connector is connected. I can't help thinking that this is a clue to the problem? Definitely no beep codes and no external devices connected. I'll try booting it tomorrow with the monitor connected, but when the problem started there was no communication with it.
I'm not worried about replacing it if it doesn't work, it was only a Frankenstein machine built from bits of two desktops out of interest, and I don't actually need it, it's just a spare tbh.
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