>> Power supply is a favourite, the 5v is probably failing.
I think you're right. Left the PC in standy mode, hooked up a multimeter to the 5 volt pin on the HD connector and then woke the PC up. Initially the voltage was < 2 volts, then went up to just above 3 volts, then to 5, back down to 3 and finally settled at 5 volts.
Will do some more tests from cold start up though.
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