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As in this thread about another computer: http://www.techsupportforum.com/f15/no-signal-with-new-motherboard-134208.html thread I said I had just put my new motherboard and processor into my old computers box, when this did not work I replaced the new hardware for my old hardware but the problem is now my old hardware is not working. When I boot my pc now it says "invalid system disk" it refuses to boot from a floppy disk or bootable cd rom and even if I remove everything and just have one hard drive set as primary with no startup disks or anything it gives me the same error.

What could be doing this? The computer worked before I moved everything around.

If you have any ideas please let me know, thanks.
 

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I agree with Dai - check ALL the connections and make sure that you have the correct cables plugged into the correct ports. When you apply power do the fans startup (even if nothing else happens)? If not then either the motherboard is faulty or (more likely) the PSU has died.
 
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