Sounds like you may have shorted out the motherboard at some point during the whole ordeal. You didn't give many details though, do you have another machine to test this on?
Of course, I could be wrong, take what I said at face value.
heres my probem:
i bought a new case recently but when i installed my motherboard and everything else the computer wont boot up. ni lights no nothing
i checked and the power supply is working. also the wire are fine and the problem isnt the new case. i tried to put everything back to the old case and it wont boot up as well.
if you have any idea plz share
Thanks in advance :)))