Is there actually any sounds or signs of activity inside the case? Is it the machine that won't start, or just Windows? Is there even a processor fan operating after you power up?
If not, try disconnecting everything possible and powering up with just processor, RAM and display card hooked up. (Hey people, anyone know the keypress to get old IBM machines to display POST info at startup? - I think it was , but I'm not sure)
Anyway, if your system seems to be showing signs of activity that it diodn't before, start connecting everything else up, one by one, and try to identify the source of problems. If it's a hardware failure, as seems the case from your description, then you gotta find which bit by trial and error, pretty much.
Catweazle
Grandad
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