root password changing

I recently installed a new fedora system for my business.

never had a problem had a uptime of months until today.

we had a powercut for 2 hours and the UPS failed...

so after the power came back.. servers came up... cept one.

i went to investigate, seemed the root password was changed.

ok so i reset the password with single user boot, restarted worked fine.

just to test i restarted it again, then it seemed the password had been changed.

no other person had access to this server while i was working on it so it cant be anyone else changing it.

tested 4 times same thing everytime.
tl;dr password is changing when i restart wtf?
anyone know how to fix?
(using fedora 8)

>>2
It's a little-known fact Windows servers continue to run for up to fifteen days after the power has been cut, amirite?