Inverted colour on display

Hi all smart people,
Yesterday I took my iBook G4 to Uni and then home again and obviously somewhere along the way I bumped it or did something to it because I went to open it up this morning and the screen is not working properly. The computer works fine except that it seems the screen has been inverted. All the colours have been inverted.
No idea what could be wrong as I have no experience in these things.
Thanks

I am having this same problem, it is not hardware related from what i can tell.
On my Powerbook G4 1.25 Ghz computer, today i came home and the screen had gone inverted (like a negative image filter is on every single item on the screen) -- then. I rebooted, and the startup screen was normal Apple Blue, i could even choose between my 2 usernames on a Login screen.
after logging in, the screen is back to being invterted, so it must be some sort of user preference that got corrupted.
sounds like the same problem soopahero is encountering.
Another factor: when I login remotely (via VNC), i do not see the colors inveterted in my remote window.

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