sounds like overheating... have you tried checking the temps in bios or mbm?

also checked that, both temperatures are well within acceptable range

Mine does this from time to time.. I havent gone over the PC in full yet, but I am suspecting it's an intermittant issue with my Intel SSD or MB.

To me, that actually sounds more like a flaky mainboard. If his fans are going completely berko, it normally indicates that the data being received by the mainboard's temp sensors is either wrong or not being received. Sounds almost like the system thinks there's a massive overheating issue and shutting down to try and protect itself. If your temperature isn't actually a problem, it seems logical to me that the next most likely culprit would be the mainboard.

My CPU heatsink was chokers with dust, was fine when doing nothing temps where ok but not overly high.

Opened a game CPU heated up quickly and would crash, cleaned off CPU heatsink fine after that.

Might not be same issue but something to look at.

hey ohhh
check your PC for dust. Hot days the problem gets worse.
Dust clogs up on the vents that suck the air in and that creates more heat inside the PC.

Be sure and check if there are vents under your case.
Mine had one because the power is on the bottom the case, and I hadnt noticed it. It looked like a shaggy mat when i found it.

Mine overheated late yesterday afternoon.
I hadnt cleaned it for a while.
Check the fans on the CPU and Videocard too.

wtf? I've got 2 570 OC's and they run just fine in this 35 degree heat.

playing cod4: one GPU @ 65 and one @ 49. You'll be fine.

you should turn off "reboot after critical error" in advanced system properties to get a better idea if the OS is blue screening or the pc is overhheating

@ Whoop - CoD4 is not exactly taxing as Farcry 3 is though.

I would re-seat the video card and check that it is installed correctly. If nothing works your card may be faulty and you can take it back to the place you got it. My previous GTX570 worked fine until one day it kicked the bucked a month or 2 after I got it.

boot up in safe mode.. this increases system stability by disabling most common driverss that may lead to a crash during your investigation of the problem

open compmgmt.msc

goto 'event viewer' --> 'Windows logs' --> 'System'. (Feel free to check out the rest of the stuff in here later on as it's good to read through.)

the list in there contains logs most noteable events in Windows - hence the name. Even though you're machine is randomly rebooting right now, odds are the problem was being logged long before that. Windows may even have popped up a dialog window at some point along the way and told you as much.

By clicking on the 'Level' tab at the top of the list you can view these logs in level of severity rather than the traditional chronological view. You can Google error codes in these logs if you don't know what they mean.

A failing AMD/ATi video card log usually list as AT***.* as the source.

A failing NVidia video card log usually list as NV***.* as the source.

*Critical* errors are the ones we're most interested in here.. there's a whole bunch of them, and they're all categories and numbered so that they can be looked up later online if need be. Here's one I had back in August after a game clashed with another background program and went on to lock up on my PC.

Keep in mind that it's not uncommon to see videocard errors in the logs under the 'Warning' level. This is usually driver/program glitches. For example, if I use FF to view more than 2 YouTube tabs my video will fail and then recover - resulting in a yellow 'Warning' error being logged. I still don't know for certain whether this is a hardware driver issue, card firmware fault, FireFox bug, or whether the computer just couldn't handle that much donkey pr0ns :/

Hope this helps.

- if running SSD update firmware (requires format however)

lulz