I used to have my computer running pretty fine until earlier this week, upon browsing on the interwebs, my computer suddenly restarted by itself without caution.
When it rebooted, I got a CMOS checksum error. To go further I continued with the rebooting, and Windows loaded without errors.
The computer seemed to run fine by then, but after some time it just froze (I wasn't playing any games with it, I'm just browsing with Firefox and maybe had Adobe Flash running in one of the tabs for YouTube). Tried to do Ctrl+Alt+Del but no response. I then tried to press the NumLock or Caps Lock key but the keyboard light didn't turn on or off.
I pressed the power switch to turn off the computer, and turned it on again. CMOS checksum error appeared again so I looked into BIOS. It actually froze in BIOS setup as well (while looking around), so I had to reboot. Entered BIOS again this time successfully, and changed my settings to failsafe instead.
The computer ran fine afterwards, so I did a chkdsk (no errors), the Windows memory diagnostic (no errors) and did the sfc /scannow thing...it had a log, which from what I read should involve my much earlier attempt of getting Windows Mail to work in Windows 7 (I can't fully tell if there are any other things wrong in there), but that was like 1 year ago and I have switched to using Thunderbird some time after that.
I also changed my CMOS battery just in case the battery was indeed dying, just to be safe. Did some cleaning of my computer's innards while I'm at it.
I also rolled back my NVIDIA drivers
since about 1-2 weeks ago I installed the latest NVIDIA drivers, but the new driver
crashes at times even when I'm not doing anything. I did a clean install of a previous version of the NVIDIA driver, thinking that the driver update was part of the reason as well.
After having this worked out, and the computer not crashing, I switched back my BIOS to the optimal setting and then played Borderlands, without issues, the computer didn't freeze or BSOD, and I can go back to Windows fine.
The computer ran fine until today where it just froze again. I rebooted, and to be safe I changed the BIOS setting to the failsafe one.
I haven't changed any hardware since I built the computer. The Windows 7 was upgraded from Vista and I migrated the HD to this new computer below. This build has been running for around a year or so without issues until now. My specs are below.
I really hope it's not a hardware or especially a PSU issue, though. Thank you!
OS: Windows 7 Home Premium 32bit SP1
CPU: AMD Phenom II X4 955
Mobo: MSI 870A-G54
RAM: 4GB DDR3
GPU: Galaxy NVIDIA GTX 560Ti
HD: Western Digital WD6400AAKS
PSU: Antec Neo ECO 620C