Basically swapped mobos on this old comp which all worked with a working mobo, RAM, CPU. It booted first time and i thought the heatsink wasn't on properly so i gave it a little nudge to make sure it was okay and it was but then it just died. I then tried to turn it back on again but now all the fans spin up of about 2 secs then dies again. The mobo on light will only turn on now when you push the on button not when power is present. I checked the cpu and its fine and I've tested the RAM which is also fine. I've tried just booted with the mobo in the case the same happens.
Thanks.
EDIT: Now tested another mobo in it and the PSU is dead!
Thanks.
EDIT: Now tested another mobo in it and the PSU is dead!
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