After a recent power failure, my Fedora linux system resets during the boot process and then boots again. It does not appear to be a kernel panic (no panic messages on the console) or an orderly shutdown. It is as if the reset button was pressed.
I can boot into single user mode successfully. The file systems appear intact. It seems to reset just before X is started (the date on the /var/log/Xorg.0.log file is old). It will boot a live CD into multi user mode and start X just fine. I have replaced the video card and power supply and tested the RAM (memtest overnight).
I suspect it has something to do with the software, but not 100% sure. I have backups, but have no idea where to look. The last thing in the /var/log/messages file is the avahi daemon finishing it's startup and one acipd log message. I have checked all of the files in /lib/modules and /usr/lib64/xorg/modules and they match the backups (even going back to backups before the last successful boot of this machine).
Some suggestions as to how to proceed in diagnosing this would be welcome.