New case and now it won't start

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Honorable
Dec 10, 2013
6
0
10,510
Motherboard-gigabyte ga-990fxa-ud3
CPU-AMD FX-8150
PSU - corsair TX750
RAM- 16GB (4X4) corsair vengeance
GPU - gt 460
With corsair h80 cooler

So here is what is happening. I just upgraded cases for my 2 year old build. I got a fractal design XL R4. I put everything in the new case without any issues. The only new thing I got besides the case was 3 new fans. After I got it all put in the new case when I went to start it up it will shut down after a little while, Usually between 5-20 seconds. It will stay on if I hold the reset button but will not boot until I let go of it. I have checked the bootup checklist on here and everything seems to be good. Dont know about the CPU cooling though. I have no thermal paste so I cannot reseat it right now. What else could it be?