Colours in screen/display appear to be in negative

I opened my ibook and the colours on the screen are now horible making everything appear blurred. Everything elese works ok.
The prevelent colour seems to be pink - that is that white is now pink. I have checked the display in preferences of course but it does seem clear there is a major display problem.
Can anyone suggest what might be the problem? I dropped the computer at an airport (it was in the case),
Thanks
gordon mann

Thanks for the response.
I think I didn´t explain the symptoms very well.
An engineer in an Apple dealer here in Mexico City tried fiddling with the universal access´ but nothing happened. The same engineer said I need a new screen or a new computer.
The colours while appearing to be in negative are distorted and there are lines horizontal across the type or images. And I feel as if green is missing from the mix though this is just a guess.
I´m sorry if I can´t be more specific or descriptive but I want to ask more Apple ´friends´before I make drastic decisions.
Did my dropping the computer do this?
Any further views will be very welcome.
Thanks
Gordon Mann

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