Computer Turns on for a split second and shuts down.

You most likely have 1 of 2 issues going on. You have incorrectly installed the motherboard on the standoffs, meaning a standoff is not in the right place or your dont have the cpu power plugged in from your PSU to your motherboard.
 

Jonathan Conrad

Reputable
Mar 18, 2014
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4,640


Sorry, I was on a trip when I posted this and I recently got back, the CPU power is firmly plugged in (I re-did it)