Random lockups/screen freezing (no BSOD)

Below are my specs,
120g sandisk SSD
i5-2500k (non OC atm) CPU
CMH 212 evo (cpu cooler)
G skill 8g DDr3 1600 RAM
Asrock z77 pro4 MOBO
Antec 520W high current PSU
670 gtx gigabyte windforce OC

I built this computer about a month ago and for the last few weeks I have been getting random screen freezes (no BSOD, screen just freezes, no mouse no nothing, have to reboot). This occurs during games as well as with nothing running. Tests I have done so far, run memtest and ram appears to be fine, run a hard drive check and that was all good. Have swapped out my PSU with a mates 650w and the error still persisted. Also took out GPU and error still occurred.
I also reinstalled windows 7 and I'm still getting freezes. Since I'm not getting a BSOD is it safe to say this is a software fault?
3 answers Last reply
More about random lockups screen freezing bsod
  1. to rule out the hardware you can boot off an Ubuntu or Fedora live CD and see if the problem persists.
  2. I forgot to add that I booted into safe mode and there was no freezing after 12 hours (computer will usually freeze from startup by 10 minutes to 4 hours). Is that the same as the two options above?
  3. Having the exact same problem :/ been looking for ages can't seem to put a finger on it.
    Guess ill have to buy some new ram and see how it works.

    If you find a solution please post it

    Thanks
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