Colour of screen display changed to  purple intrrupted by vertical lines

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Dear all
As I was viewing a page in Safari the colour of screen display changed to purple intrrupted by vertical whitish lines. I have tried adjusting the display from Preferences with no success. I have also checked my iMac using Tech Tool Deluxe and this revealed no problem. Anybody with suggestions?
Thanks
iMac intel duo (late 2006)   Mac OS X (10.4.9)  

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Sounds like a hardware problem with the LCD panel, Tech Tool is not going to detect anything like that. Time to call Applecare and see if you can get replacement.

November 30, -0001

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