Mine used to go a very strong pinky colour, and it was the dodgy connection from the Graphics card to the monitor which was solved by a few gentle nudges to the connector.
It sounds to me like your graphics card is a bit screwed up, maybe damaged memory like Triple X Dread said.
How old is the laptop, and what is your graphics set up at the moment? Something integrated?
'Make Love and Revolution'

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AMD Athlon 64 X2 Dual Core 3800+ CPU | 2GB PC2-6400 DDR2 RAM | BFG 8800 GTS | Logitech MX518 Mouse | Yusmart monitor 19" 1280x1064 @ 75Hz | 500W Tagen PSU | The most Shiny Metal Case | 3 Fannin' Fans | a very flat keyboard | 5.1-ish surround sound | A User that is very pennyless!
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