New-ish Build Rebooting Randomly, Almost Out of Ideas

I built a new computer over christmas break this last winter, about 6 months ago. Ever since I started using it, it will shut down randomly. This will happen when I open a new program, play a game, open a web page, watch a video, or just when it's sitting there not running anything. It will then turn itself back on, with no clues as to why it shut down. Here's the build:

Intel Core i7-3820 3.6GHz (3.8GHz Turbo Boost) LGA 2011 Quad-Core Desktop Processor
Intel BOXDX79TO LGA 2011 Intel X79 SATA 6Gb/s USB 3.0 ATX Intel Motherboard
2x Crucial 4GB 240-Pin DDR3 SDRAM DDR3 1333 (PC3 10600) Desktop Memory
Raidmax 730W ATX12V / EPS12V Power Supply
SAMSUNG Spinpoint F3 1TB 3.5" SATA 3.0Gb/s Internal Hard Drive -Bare Drive
EVGA GeForce GTX 650 Ti 02G-P4-3651-KR Video Card
LITE-ON DVD Burner - Bulk Black SATA Model iHAS124-04
Thermaltake Commander Series VN40006W2N White / Black SECC ATX Mid Tower Computer Case

Initially I thought it the system could be overheating. However I've checked the temperatures right before the computer unexpectedly shuts down and it's not that high anywhere, around 55°C at most.

Next I thought it could be the power supply malfunctioning or not be providing sufficient power, but I have posted on here before and a few people assured me that power supply was a good make and more than what was needed for the system. I also tried using a friend's power supply and the system would still shut down randomly.

I then thought it could be the RAM, so I ran memtest86 with both sticks of RAM in and then with each stick in by itself, and no errors came up. I'm not sure if the RAM is underpowered and this is causing the system to shut down, but everything is compatible as far as I know so it shouldn't do that.

I'd also like to add that from older posts on some forums and reviews (about a year old from what I've found), the CPU / MOBO pair I have can have some compatibility issues. From what I've read, this is due to the BIOS version that the MOBO comes with, and I think they've since fixed this issue. I checked on the Intel website and it says that they are compatible with BIOS version 0460, which is what I have.

One other strange thing that happens when I reseat the RAM sometimes is that the system will turn on for a second, then turn back off and not turn back on until it is unplugged. I've tried removing the CMOS battery and letting it sit for a few minutes, and sometimes that works, and sometimes it doesn't. I've also tried changing the PSU setting to the European voltage, 220V (which is probably a bad idea but I was out of good ideas), and it turns on but won't boot. When I try to turn it on after doing that and switching the PSU back to US voltage (130V) it will boot fine.

I have a feeling the problem has something to do with my RAM being maxed out, but I don't know enough about it to know if that's really what it is.

I've read a lot of threads with similar problems but I have yet to find a good solution. I appreciate any help you guys can give me. Thanks!
14 answers Last reply Best Answer
More about ish build rebooting randomly ideas
  1. What's the model # of the DRAM, that way we can check timings, voltages, etc
  2. Tradesman1 said:
    What's the model # of the DRAM, that way we can check timings, voltages, etc

    Model number for the DRAM is CT51264BA1339
  3. Best answer
    Ok looks like it's two single sticks? (each in it's own package?) if so sticks in slots A1 and B1, and lets try setting manually the freq to 1333 (and it's prob at 1333 under AUTO but enter it manually), enter the base timings as 9-9-9-27, enter CR (Command Rate as either 2N or 2T (not sure which letter designator your mobo uses), set DRAM voltage to 1.55 then see how it goes
  4. Ok I'm giving that a shot right now, so far so good. I think my RAM slots on the motherboard are just set up as 1-8, so I have them in slots 1 and 2 right now (I don't know if that makes a difference, I wasn't sure what you meant by A1 and B1). I also wasn't sure which timing to change, but I assumed if was the fourth one down, tRAS, which I changed from 24 to 27. The others were already at 9. I did bump up the voltage to 1.55 V too.
  5. Just rebooted randomly again, as per usual. I appreciate the help though, anything else I could try?
  6. Prob slots 1-3 from CPU, you have 4 channels A, B, C, and D so want them in A and B the first slot for each, see how it goes, I'm hitting the hay for a few hours will check before I head out in the AM, will be on-site at a job most of the day
  7. Oh I see, that makes sense. Well I got the sticks put in those slots, and it's still rebooting on me. Thanks for your help, I'll check back on this thread tomorrow.
  8. Let us know
  9. It's still randomly rebooting with those settings. Does that mean that it's not the memory that has a problem? I was considering borrowing some faster DDR3 1600 RAM from a buddy and seeing if that helps.
  10. That would be a good idea, might narrow things dowwn
  11. Still rebooted unexpectedly with the new RAM stick (brand new Corsair Vengeance 4GB DDR3-1600). The computer wouldn't POST initially when I put it in, but I reset the BIOS settings to default and it booted ok. Not sure if that means anything.
  12. Sounding like bad RAM slots/mobo itself or CPU
  13. Anything I can test to tell if the MOBO or the CPU is bad? Maybe just run it with no other components?
  14. Yes if you can do that, would be much better!
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