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Computer shutting down randomly.

I have a homebuilt PC that I use for casual gaming that's been fine until last week when it began shutting down randomly. It could go for hours or days without issue or it could shut down every 15 minutes. It would shut down during virus scans specifically and it would shut down when I tried installing Guild Wars 2. I couldn't figure it out so I took it to a local PC repair place who said they ran virus scans fine and installed/played the game without any issues, but somehow they were able to determine my HDD with Windows 7 was failing and that was the problem. So I bought a new HDD and did a fresh Windows install, played Guild Wars 2 for a little while and then it shut down again. This would also happen when just web browsing but seemed more frequent during gaming.

Cooler Master HAF 932 case
CPU: Intel Core 2 Quad 2.4GHz
MoBo: Gigabyte P45T-ES3G
RAM: 8GB DDR3 G.Skill
GPU: GeForce GTX 460
PSU: Corsair HX750w modular
HDD: a 750gb Seagate SATA and a 500gb Seagate SATA (brand new)

I have no idea what to do! Buying diagnostics and replacing the allegedly failing hardware did not solve my problem. Any ideas?
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  1. To add, I was able to reproduce this problem three times after posting this by playing Guild Wars 2 in really high-latency areas. Hope this is more helpful.
  2. sounds like to me that your card is failing on you... what are the heat ratings while you are playing a game?
  3. Using CPUID: Hardware Monitor, my CPU is desktop idling at 180-212 degrees Fahrenheit. My GPU is at 100 degrees. Not sure if those temps are good or bad, but I can't fathom another way to add cooling to this case. There's 4 gigantic fans all working fine.
  4. well have you ever thought about re-applying the thermal paste for the cpu?
  5. I did. No change. Also tried my old core2duo wolfdale which never gave me problems and it still ran close to the same temperature. All fans are running. Heatsink is seated properly.
  6. Best answer
    it sounds like actually like a mobo issue do you still have covergae on it?
  7. I don't. It was a Gigabyte, older model.

    Important update on this: Yesterday it froze at the desktop and I had to hard shut down and then Windows did a disk read error. Keyboard didn't work in BIOS. Eventually it started freezing in BIOS, CMOS and safe mode. It gradually would last longer before freezing and I was able to get to my desktop and open Firefox before it froze again and I haven't touched it since.

    Everything looked fine, PSU and GPU are brand new. RAM and MOBO are fairly new. CPU's are both older 2.2-2.4ghz socket 775. For lack of any other ideas, I ordered a new CPU and MOBO:

    ASUS M4N98TD EVO AM3 NVIDIA nForce 980a SLI ATX AMD:http://www.newegg.com/Product/Product.aspx?Item=N82E16813131636

    AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 125W Quad-Core: http://www.newegg.com/Product/Product.aspx?Item=N82E16819103727

    Hopefully after these it will run fine, or I just bought a new MOBO, CPU and HDD for no reason. :(
  8. is it doing this with the new mobo, cpu and hdd? also dont feel bad about getting a new cpu, mobo, and hdd it probably was about time for an upgrade anyways considering you dont even have coverage anymore :P
  9. I don't know. It's now giving me an entirely new error of course. Will have to make a separate thread regarding this.
  10. so then what it is not restarting any more?
  11. Problem solved. New motherboard and CPU fixed the initial freezing and shutting down problem and a full reinstall of Windows fixed the new boot error.
  12. Awesome! :D glad it was fixed... also what kind of cpu do you have now?
  13. AMD Phenom II X4 965 Black Edition Deneb 3.4GHz Socket AM3 125W Quad-core
  14. nice... your set for a while
  15. Best answer selected by jlawrence85.
  16. so was it fixed?
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