Boot lock after root password change

This is probably a question for RoaDKilL.

Customer changed his user and root passwords from installation DVD because he forgot his old one. Customer has been known to take a nip or two. Unit boots up to log in screen. When new password is entered nothing happens. It does not go on nor does it shake. Would not go to target mode nor boot from internal DVD. I dropped in a formatted brand new 320 drive. Boots to very slowly blinking folder with question mark. Screen seems dimmed. Will not see DVD internal or external drive. Tried external keyboard to no avail. Will not reset PRAM with internal or external keyboard commands. Removed additional RAM, no results. Made image of old drive and image will not open on another Mac with the new password. I can't think of anything else to do.