How can you change the password on your PlayStation 2 if you have forgotten the previous password

Press the SELECT button and enter the 4-digit number "7444" whenever the Parental Control display asks you for your password. The old password is deleted.
You will then be prompted to enter a new password, enter whatever number you want, something like 0000, or a number that is easy to remember. If you wish to turn it off, just set it to off and forget about passwords.
Notes
- When you play DVDs which do not have the Parental Control function, playback cannot be limited on this player.
- If you do not set a password, you cannot change the settings for playback limitation.
- Depending on the DVD, you may be asked to change the parental control level while playing the disc. In this case, enter your password, the change the level. When you stop playing the DVD, the playback limitation level returns to the original setting.

After changing DVD settings:
To save your changes, be sure to eject the DVD before pressing the RESET button or turning off the unit with the MAIN POWER switch. Please note that changes will not be saved if you reset or turn off the console without first ejecting the DVD.
Sony Playstation 2 manual, pg. 19