Computer Keeps Shutting Down

Mz_Blackrose

Honorable
Jul 17, 2013
32
0
10,530
This may be in the wrong section but I hope someone can help. Just got home about twenty minutes ago and powered up my computer. The fans and lights came on but it sounded a lot quieter than normal, like something was missing or it was powering down. Then it did just that - powered down. I booted it back up as normal and it cut on and I immediately directed myself here. I would like to also mention that I get BSOD crash messages much too often for comfort. Just got one about the memory_management. I do have Windows 8 and some people were saying they get BSOD sometimes with Windows 8. This is a custom build and I built it back in August. Some people said the shutting down could be due to a number of things but I notably saw my PSU could be the issue. It's a new Corsair HX750 that shouldn't be shorting so soon.

Basically my questions are:

What is caused my computer to not even come close to booting up?
Why do I continuously get these BSODs? >_<
Please help! Thanks in advance. ^.^