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Computer Randomly Rebooting - no BSOD

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September 24, 2013 7:40:28 AM

Hi, I have a two year old computer (priorly very stable) that has now started randomly rebooting. It does this regardless of the OS (I have Windows 7 and Linux dual-boot) and seems to prefer to reboot when under load. I can run internet browsers (email, streaming, etc.) and office suites without any problems but if I load up games (ex. crysis) it hard restarts in the first 5 min of the game. System is not overclocked.

Build:
CPU: Intel Core i7-2600 Sandy Bridge 3.4GHz (3.8GHz Turbo Boost) LGA 1155 95W Quad-Core
MOBO: MSI Z68A-GD80 (B3) LGA 1155 Intel Z68
RAM: CORSAIR Vengeance 16GB (4 x 4GB) 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800)
GPU: EVGA 01G-P3-1561-AR GeForce GTX 560 Ti FPB (Fermi)
PSU: PC Power and Cooling Silencer Mk II PPCMK2S650 650W

What I've Tried:
Disabled Windows auto-restart - still no errors, Windows seems to think the power just cut out
RMA'd the RAM - didn't fix it
Running Speed Fan - All internal sensors are reading normal, CPU never gets above 85 when stress tested
Stress Test - Ran both Prime95 and Furmark, sometimes these cause a reboot immediately, sometimes it takes a while. Sometimes reboots running them individually, sometimes not. When reboot happens, sometimes it seems to get stuck in a reboot loop and will reboot before the OS finishes loading. Could it be the PSU overheating?

Super lost on this one, I'm decently tech savvy but I think I'm over my head with this one.

More about : computer randomly rebooting bsod

September 24, 2013 7:51:17 AM

unlikely if the fan is spinning.
check the ahci menu in the eufi and see if you have hpet options. if so make sure there enabled and set to either 32 or 64 bit depending on your o.s. sometimes you just get the option to enable it. if it was disabled then its likely this has something to do with your random bsods.

also get bluescreen viewer. it will allow you to look at your crash logs in a readable form,.
lastly check your event logs (ctrl panel/admintools/event viewer, application, then system. see if you have any errors saying error 41 or 124.
41 just means your pc shut down unexpectedly due to loss of power. so can be ignored. for this but you do want to look at the errors just preceding it.
124 means your cpu or ram is undervalued and causing a shut down.
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September 24, 2013 8:02:09 AM

As far as I can tell the HPET is still enabled, I haven't changed anything in the BIOS from the default settings (I'm not quite savvy enough to want to risk messing with it). I'll try the bluescreen view tonight.
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September 24, 2013 8:38:06 AM

its normally disabled by default mate. so its worth checking. you dont have to change anything else just that if its disabled.
what it does? it is a hardware based timer thats independent of the cpu that helps certain intel and windows tasks keep proper time. without it they will randomly crash taking your pc with it.
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September 24, 2013 10:52:14 AM

Ok, So I double checked the HPET and it is enabled. I couldn't see where it said 32 or 64 though. I also downloaded BlueScreenView, but apparently I don't have any minidump files. I went into settings and swapped it from kernel dump to mini, and then made the system crash, but still no files. Does this confirm that there is a power interrupt as opposed to a true BSOD?
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September 24, 2013 11:45:50 AM

starting to sound like it. can you test the psu in another build?
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September 24, 2013 6:36:17 PM

I don't have access to another build or PSU. I just bought a new PSU, so I'll try that when it gets here and if it doesn't work, I guess I'll have an extra for next time.
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