check root filesystem
/:has been monuted 21 times without being checked .check forced
/:*****reboot linux *****
/:92604/615296 files (0.3%non-contiguous).498789/1228964 block [FAILED]
*** an error occured during the filesystem check
*** dropping you to a shell; the system will reboot
***when you leave the shell
GIVE ROOT PASSWORD FOR maintencance
(or type control-d to continue):_
It looks like the system found an error while fsck. Check the bios setting of the hard disk if it is correct. Try to scan the hard disk with some tools to find if there is any bad sector.