1.Reboot the PC.
2.Press "e" key when show the OS select by GRUB.
3.Input the "single" behind the "kernel /boot/vmlinuz-2.6.15-1.2054_FC5smp ro root=LABEL=/ rhgb quiet".
4.Press "b" key to boot the system.
5.Modified the password of root user by "passwd root".
6.Reboot the system after mocified the password successfully.
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