PC turns itself off and doesn't boot up again

Whilst playing games my PC decided to shut down. After it shut down it would boot up for about 2 seconds and cut out. It would do this on repeat. I had this problem about a week ago and thought it was the PSU so i replaced it with a new one. Now its happening again, I read that it could be the bios so I reset it by taking out the cmos battery for about an hour and it worked...for about 2 hours then the same thing. Today it wasn't working either until I got home where it turned itself on and is now working. Any chance anyone can solve this?

Specs:
CPU: Intel Pentium G3258 3.20GHZ
Mobo: gigabyte GA-H81M-S2PV
Ram: Geil 4GB DDR3 PC3-12800
CPU cooler: stock
Video Card: Asus gtx 680 directcu ii
PSU: cooler master gx 750w
Case: an old custom one my stepdad had
6 answers Last reply
More about turns boot
  1. How do your temps look?
  2. Have you updated the bios to the latest version?
  3. Barty1884 said:
    How do your temps look?


    fine
  4. Fine = ?
  5. SgtScream said:
    Have you updated the bios to the latest version?


    just done this will let you know if it does it again.
  6. Barty1884 said:
    Fine = ?


    CPU not going over 60 c
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