PC shuts off/becomes unresponsive after running GPU heavy applications

CPU: AMD FX-8150 3.6GHZ
MB: Asus Sabertooth 990FX SATA3 USB3 AM3+
RAM: ADATA 8 GB DDR3/ 1600 MHz
PSU: Xtremegear 800 Watts
VC: AMD Radeon HD 7870

When running GPU heavy applications such as video games (everything else works just fine), my computer will appear to shut off. I say "appear to" because while the display and the fans abruptly shut off, the light on the motherboard is still on and the lights on the front of the case are still on, but the buttons will not respond.

In order to get it to start again I have to unplug the power supply, wait until the power drains, and then firmly plug it back in again. If I don't jam the plug back into the power supply firmly enough, pressing the power button will only start it up for a few seconds before it'll shut down again.

I've had a short history with heating problems with this PC. Hot room in the heat of summer, mostly, but I've managed to keep it under control for the most part by adding a strategically placed fan or two.

Mostly, I'm suspecting that my problem is the power supply (I have a Corsair Enthusiast TX 750 Watt coming in the mail today, will try it out as soon as I get it), but I worry that struggling with heating problems all that time has fried something important and expensive, particularly the CPU and motherboard.

So far, I've reseated pretty much everything inside the case, switched out the video card for another Radeon HD 7870 I had lying around (no change as far as I can tell), blew out any dust that was in there and made sure the radiator was clean. I doubt that it's a heating issue now because it shuts off as soon as it loads up the 3D models and environments, sometimes even just before.

Hopefully, the new PSU will fix the issue, but just in case it doesn't, I wouldn't mind hearing what you guys think might be the problem. I'll update you guys once I test it out.
3 answers Last reply Best Answer
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  1. Best answer
    That PSU is complete junk. It probably makes less than 500w at VERY unstable voltages.

    The replacement PSu should fix this problem.
  2. Well, I've got everything hooked up and running fine. So far no signs of hiccups or shutdowns of any kind.

    I think...I think we're going to be okay. :)

    I'll update if the problem recurs. Thank you guys so much for all the work you do!
  3. Always glad to be able to help! Glad it seems to be working.
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