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I barely started working this morning, when my beloved desktop totally froze and gave me a blue screen of death! I haven't seen a BSD in some years. I tried to restart, but the bios did not boot Windows, but tried to boot from some utility over IPv4! It was trying to boot from an OS on the Internet! Yikes!
After some head scratching I went into the bios and sure enough: The preferred boot sequence was: First via IPv4, then IPv6, and lastly Windows. After fixing the sequence everything was seemingly back to normal. Out of an abundance of precaution I re-imaged the systems drive using my latest Macrium image.
It just bothers me that my bios settings were changed. I must confess it left me a little nervous!
How old is your system? It could be just that the CMOS battery has died. Power off, and either disconnect power or switch off the PSU. Wait 10-30 seconds, and power back on. If you're back to the the previous boot order and the date/time has reset, you need a new battery. They're readily available and normally fairly easy to replace. Worth testing at any rate before you get too paranoid.
Interesting. Just this morning, I experienced, on my own system, the sort of freeze that I haven't seen in a solid decade - mouse/keyboard not responding, not even Ctrl-Alt-Del could elicit any sort of response. Unplugged both the mouse and keyboard, still nothing - and this time the CapsLock and NumLock keys wouldn't trigger the lights for them. The mouse is going through a powered hub, but the keyboard is plugged into the PC itself, so that ruled that out.
Rebooted, all fine, and the system didn't report anything unusual, at least to the extent where it could have captured *some*thing in the event log.