I tried single user mode and change my password, and it said that it successfully changed. But when I tried to log in it still said login incorrect.
Sorry, my system is x83 I made a mistake. I've been trying to boot from the cd but it won't. I tried grub append>boot cd. I tried grub append>boot cd rescue mode. But it always booted from the harddisk. The cd I'm using is CentOS 5.3 cd #1. What's the exact append command I should use to force boot from the cd.