New build - FAIL!

right, I made sure both 6 pin power on gfx card, its in the top slot,BUT NOW i have a different problem which leads me to think its the motherboard..

It now turns on... for about 20 - 30 seconds then turns off?? i tried pressing ctrl alt del on keyboard n that seemed to restart it and the lights on keyboard work... new mobo *** then? as it shouldnt turn off like that.

Mine did this when the heatsink wasn't seated properly, the CPU was overheating after about 30seconds and the computer would shut off...
 
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