I have an old PC which occasionally use as a spare. Most of the time it just
sits on a shelf, and its been about 6 months since I last used it. Having
recently dusted it down it won't start. Lights come on on the front, and it
sounds like the disk spins up but the screen remains blank and I don't even
see a BIOS message.

I'm reasonably sure the monitor is okay (but I will try plugging it in to
another monitor just to be sure).

Any suggestions on what I should try looking at?

If need be I can buy a replacement power supply. I don't have a spare but
I'm not sure its worth spending any more than that type of cost on it.
Although otherwise the box was quite reasonable for the odd use I put it
to - its a small form factor shuttle, with hyperthreding, xp pro. If its the
motherboard thats shot then I'm not sure its worth replacing.

Any thoughts or suggestions would be appreciated.

TIA.
--
Brian Cryer
www.cryer.co.uk/brian