powerbook 12 lcd problem+reset main user

dado_q

Registered
Just got an used Powerbook 12 G4 1.33. The monitor has a brighter area on its bottom, that covers about half the dock. It's not like a perfect brighter rectangle; it's more like a glow "effect". The image is still perfect there, but it's way brighter. No matter how bright the whole screen is (through the brightness control on the keyboard), the brighter part is still there, proportionally brighter or darker. Is there an easy fix to this? If not, what are the odds that the brighter spot gets bigger and, say, cover half monitor, or grows brighter 'till I loose those pixels??
About reseting the user, how can I change the main user's name and abreviation name without reinstalling OS X nor screwing the files system? Something to do with booting to command line mode only... 10.4 here.
Thanks a lot, I really appreciate your help!
 
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