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if you've lost the PSU you could do worse than to save yourself the effort and get an ex-coporate re-furb machine: if you're in the UK i can tell you some websites but if not they should be easy to find. they come with warranties but you get an old machine for little money - perfect for a net client or a 'homework machine'.
otherwise, go right back to basics, unplug as much as possible and add things one at a time. the basic bare minimum is:
mobo and CPU,
memory (only use stuff u know has worked in the board)
graphics card.
if you can get into the bios ok, try adding the floppy, then the hard disk, then any other cards, until it stops working or you have a full machine. if it stops then you know more or less exactly what's wrong, either the part you last added or the corresponding feature on the motherboard.
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