Computer shuts off while gaming no warning

I have an issue with my computer. Mostly when playing game on my computer ill get about 5-10 min of gameplay before my computer will just shutoff with no warnings what so ever. I can leave my computer on ideling for days or anytime i want to surf the internet with no issues, but if I start gaming, it will shut off. I had the computer built about 3.5 years ago so after the first 1-2 times this happened, i decided to open it up and give it a good spray cleaning. It seemed like this helped for about a month but its happening more frequently.

I installed Core Temp 1.0 and get temperatures that float around 95F surfing the web and about 115F gaming, is it a heating issue then?

Windows 7 Professional
AMD Anthlon II x3 435 @2.9 GHz

G. Skill 4 GB dual channel DDR3 @669.7 MHz (I think, im not exactly sure if i im reading the specs right)

Gigabyte GA-MA770T-UD3P AM3 AMD 770 ATX AMD Motherboard

Radeon HD 4870

Corsair TX650w

If you need any more info just ask....

6 answers Last reply
More about computer shuts gaming warning
  1. 115F is just 46c. It doesn't seem to be overheating.
    Its probably the PSU that's giving out under load.
    See if you can borrow a friend's PSU, to test it out.
  2. Have you tried memtest86 on your ram?
  3. If it were memory he'd be getting a blue screen, not a shut off.
  4. Have you checked your system event log to see what error codes you're getting on shutdown? Modify your system behavior so you get a BSOD on system error. Instructions for both:
    To modify the restart behavior for the computer, follow these steps:
    - Right-click My Computer, and then click Properties.
    - Click Advanced system settings.
    - Click the Advanced tab.
    - In the Startup and Recovery section, click Settings.
    - Click to clear the Automatically restart check box.

    This will let you get the BSOD when your computer reboots/shuts down. To check for errors on previous shut downs you can check the system event log:
    - Click the Start button .
    - In the Search box, type Event Viewer and hit enter
    - In the list of results, double-click Event Viewer.
  5. It could still very likely be a ram issue, I had this happen before. It would blue screen me so fast that I wouldn't even see it. Run memtest, you'd be surprised what ram errors will cause.
  6. So i went ahead and replaced the power supply, i bought this one

    ive never replaced a power supply before so basically as i was disconnecting the old plugs i was plugging in the new ones plugs in. So i got everything all together, closed the case up, and plugged all the wires into the back. I flipped the switch on the power supply to the on position and turned the tower on. I could see on my monitor it was booting up but when it was about to get to the login screen, the screen stayed black and never went anywhere after that...
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