I have had this issue for a few months now (around November) and I have tried almost everything i can possibly think of to try and resolve it, but to no avail. I have replaced almost every piece of hardware in my PC except RAM and Hard drive itself (under warranty), did a system recovery to manufacturer setting (I have a Dell so i cant reformat with the disk), but i still encounter the issue to some extent. What happens is that while using my PC (usually watching video online or playing games) My computer will lock up and freeze. I still have control over my mouse, however any program I am currently using does not respond. I cannot exit them, I cannot CTRL ALT DLT, I cannot shut down and am forced to hard reboot. This issue only occurs maybe once a week. (Although when i had my PSU and motherboard replaced it used to happen every day. I thought replacing them fixed it at first, but it only occurs less frequently now, although the lock ups still occur). After replacing most of my hardware components/doing system recovery, and still having the issue occuring, I figured that it may have been a software/driver related issue. So i did a clean uninstall of my driver, even using the Driver Sweeper program hoping it would fix it, and installed the lastest video driver. Tried doing a clean reinstall of Adobe Flash and Java (in a desperate attempt) Hoping for a fix, but to no avail. The problem still persisted. I ran programs like CCleaner thinking it was a registry error and hoping it would fix it, but it did not. I ran a CHKDSK maybe thinking their were bad sectors in my hard drive, there were 0 bad sectors detected and everything seemed normal. (I am using a RAID 1 (mirrored) if it matters). Ran stress tests on my hardware components for the hell of it, they all checked out fine. I dont think its overheating as i keep track of PC tempertures normally with HWMonitor and I am not overclocking. I am in desperation to try and resolve this issue. I attached a dxdiag incase it is asked for and i will post anything else that is required to try and resolve this issue. Any support towards this issue is GREATLY appreciated as i have no where else to turn. Not even the Dell Tech Support service seem to know what is causing this issue. PS: I am going to throw my 2 cents out there and wonder, since prior to replacing my PSU and motherboard (since this issue occured more frequently with the ones that have been replaced) that maybe i had a surge issue with the old PSU and might have effected my RAM, which i have not replaced under warranty yet. But would a bad stick of RAM not show and issue for an entire week before acting up? Also worth noting that ontop of my PSU and motherboard being replaced that i also had my video card, fans (cause why not?), and processor replaced under warranty as well.