> I now have the motherboard, power supply, etc. laid out on my wooden
> > desktop. Same behaviour, so it's not that....
>
> Strip it down to absolutely nothing (Motherboard, CPU, RAM, PSU,
> CPU fan) and see if that much works.
Yes, that's what I've done. (See above.)
> If there's no signs of life even in a minimal configuration, take
> the heatsink off, clean it and the CPU, and re-apply the thermal
> compound.
That's my next move!
> Also try another PSU, and that PSU with another machine.
>
Yes, already done that. (See original post.)
Thanks for the suggestions: I'll let you know how I get on with CPU and
heatsink.....
Chris.
>
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