is the username root or a normal user.
If it is a normal user do the following:
1. Log on as root.
2. type 'passwd <username>'
3. Follow the prompts.
OR:
1. Start up by typing 'linux single' at the boot prompt
2. At the command prompt, type 'passwd <username>'
3. Follow the prompts
4. Reboot the computer normally.
Cheers,