My computer is randomly freezing, and I cannot figure out why. It will freeze some times after a few moments or sometimes after a few days. What will happen is the system will stop responding, then my CPU fan will start running very quickly. Then the mouse will stop responding. My system does not seem to be running very hot except for the GPU which at start up speedfan is telling me is running at 55C. Everything else stays in the 30-40C range. It does not seem that any one program is causing the freezing because it happens with anything I am running. My build as follows:
Sounds similar to my ordeal, the thing crashed half an hour ago, and has been doing it for a year.
It is a random event that can happen every day, every two days or every two weeks, it's not heat depending since the GPU can hit 90 degrees without coughing, neither it's the PSU since I've changed it four times, and it's not Windows since I've tried five different versions and it's the same crap on all.
The similarities I see are the GPU, mine is a dreaded GTS 250 too, and the Gigabyte MoBo. Could those parts be in conflict and causing the problem?
To begin with something you can check your ram with memtest and your rig with Prime95 and run every kind of antivirus and spyware you can. Check also the ram voltages on the bios, and update all the drivers you can, also use SpeedFan or EVGA Precision to control your fans manually.
Disable automatic restart on Windows to see if you can catch a BSOD and write the code. You could swap the GPU with other to see if the problem persists or use the onboard GPU for some days and borrow another PSU, that may narrow the problems.
That's pretty much all the troubleshooting I've done and so far nothing has solved the problem, I also sent the PC over to the vendors for nearly two months, and they found only small details concerning an old chinese PSU, the CPU and RAM incompatibility.
Anyway, hope you find a solution soon, for this is a very frustrating issue, and I know it...