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@Fox
Hmm. Computer died last Saturday, wouldn't post, never mind boot.
I assumed it was the motherboard, not really having any way of testing. So bought a new board, memory and processor (because none of it is compatible is it, stupid planned obsolescence).
Taking the computer apart, I found that the 4 pin ATX 12v plug was partly burnt out! Eek. The plastic around one of the four pins had burnt away and there was scorching around two of the pins, plus a little scorching in the corresponding two motherboard pins.
Various things could have caused it but it seems using a (albeit reasonable quality) 350w PSU to drive a quad core overclocked from 2.4Ghz to 3.2Ghz with a reasonable graphics card may not have been such a good idea, although it was fine for ages, so a badly fitting plug seems more likely.
Anyway, I clearly need a new PSU now (great, more money). But when I get it do I risk plugging it into the old system to see if the motherboard is ok? Or is the risk of frying the new PSU with a potentially dodgy motherboard too great?