NEW Computer shuts Off while playing High end games and loud whirring noise

I've built my computer about 2 months ago and have always had this problem (before and after OC), i've tried so many things its not even funny and i'm getting sick and tired of it.
If I play a game like Bioshock infinite or borderlands 2 after about an hour or so my computer screen will turn off, the tower makes make a loud whirring noise (I can still hear the game sounds through my headset)and I have to manually turn off the power to start up my computer again. I've replaced my PSU (which turned out to have a 12v shortage) and this problem still continues :(. I've checked my GPU temps and they never pass 60degrees. My CPU temps have been a little harder to check but the most I've seen it go up to is around 70degrees. Is the PSU still defective? is the GFX defective? or is it something else?

My specs are:
Intel I5 3570k 3.4ghz OC'd to 3.5ghz
Rageon HD 7870 Twin Frozr OC edition ghz edition 2GB video card (NOT overclocked)
1600 MHZ corsair 8 GB DDR3 RAM
asus p8z77-v lx motherboard
Ultra LSP270 750W power supply

Help is much appreciated thanks!

PS I also bought and installed an intake air fan for better circulation.
4 answers Last reply Best Answer
More about computer shuts playing high end games loud whirring noise
  1. Id start with that garbage PSU. And monitor your temps using HW Monitor for temps while gaming.
  2. Best answer
    Ultra's LSP line is a tier 5 PSU in this list( and it's suggested to replace it asap.
  3. so its most likely my PSU? alright then i'll get a replacement can soemone recommend me a good replacement PSU? or do I have to make another topic for that?

    Also how much damage (if any) has already been done to my PC (if its estimatable, but I haven't noticed any drops in performance just the shutoffs)? i've had this PSU for a good amount of time about a month and a half
    Sorry for all the questions but this is the first computer i've built and im quite new to the tech side of the world.

    Edit:Also thanks for the help! I really appreciate it
  4. I usually stick with Seasonic, Corsair and XFX, but anything in the top 3 tiers in the link i posted should be just fine. A good 500w unit will be enough for your current setup. Cant really tell if any damage has been done till we get a more reliable power supply in the mix.
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