My Mac Book Pro won't accept my password at startup

I have been using the same password for a year, now all of a sudden it won't accept the password at startup.

Hi P,
Run Repair Disk: Boot from install disc (insert disc>restart>immediately hold down c key and keep holding it until you see “Preparing Installation”)>at first screen select the language and click Continue> click on the Utilities Menu in the menu bar>open Disk Utility>select your HD in the panel on the left side>check S.M.A.R.T. status>if it says "Verified">click Repair Disk at bottom of main window. Run this at least twice, and keep running it until it says “appears ok” twice in a row. If that doesn’t happen, you may need a stronger utility such as DiskWarrior or if the directory is damaged beyond repair, you may need to reinstall the OS, or you may have a damaged HD (repair utilities can only repair the directory structure, not the HD itself). When this is finished, quit Disk Utility, quit the installer, and restart. Once booted normally, go to Applications>Utilities>Disk Utility and run Repair Permissions.
If you're still not able to log in, boot from your install disc again, select the language, go up to the Utilities Menu, and choose Reset Password. Follow onscreen prompts.
Message was edited by: tjk

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