This is an old situation i just had..

I was just online when my mum plugged the vacuum cleaner in and the power went off and the computer also went off.

I turned the computer back on and it got to the "POST" where the memory test is on start up and it said "CMOS ERROR" and it proceeded to boot to windows fine.

So i rebooted and i could not see any problem apart from the cmos has been reset and the bios settings have been set back to factory default and i can no longer see the "CMOS ERROR" error message on the POST.

P.S I have a power surge protector so when the power usually goes out it does not harm my system and scan disk on windows does not run looking for errors on start up.

So my question is what is this "CMOS ERROR" that was displayed on the first boot up after the power went out and why has the cmos battery been reset just because the power went out?.

This seems like an odd situation to me can anybody shed some light on the matter?.

Thank You