For the past few weeks, my computer has been frequently powering itself off (as in completely powering off, as if it's been unplugged) and turning itself back on seconds later. This seems to occur at seemingly random times; from right after booting up to an hour after being turned on, and can shut down both in use and when idle. The frequency of the issue has progressed to the extent that I can no longer use my computer without it shutting off before I can do anything. However, it APPEARS to run fine in safe mode, although because it's so difficult to replicate, I don't know this for certain.
After weeks of troubleshooting, this is what I've done:
I've replaced the PSU.
I've checked for overheating and replaced the CPU cooler.
I've run memtest86 and passed.
I've run Seatools for DOS on my HDD and passed.
I've done multiple virus scans in safe mode, using both Bullguard and Malwarebytes.
I've switched out the power switch.
I've ran the PC in a totally different house with none of the same external hardware.
I've restored the BIOS to default settings.
I've replaced the CMOS battery.
I've done a clean reinstall of Windows.
I've disabled all startup programs and all non-Microsoft services.
Despite all of the above, my PC still shuts down. It may also be worth noting that while it appears to run fine in safe mode, the machine shut down while attempting to use the bootable AV Kapersky Rescue Disk, but was fine while running memtest and Seatools.
Any suggestions of what to try next? System specs are in my profile.
Edited by hamluis, 13 January 2015 - 12:17 PM.
Moved from Win 7 to Internal Hardware - Hamluis.