IMac screen: the light colors are gone to white

iMac screen: the light colors are gone to white. Not only in my windows, also in all browsers, etc. Must be a software problem, if I start up from an external disk it's OK. Possible a bad file in my User library but which one?? I did fresh install Snow Leopard, then it was OK again, but when I started some applications it went wrong again. Has anyone ever seen this?? I went to the Apple store and they could not help :-(

Screenshots do not show what you are actually seeing on the monitor.
Try holding the (Control Command Alt) keys and pressing the (Comma) key several times.
Alternately go to: Apple / System Preferences / Universal Access and in the Display section make sure that Enhance contrast: is set to normal.

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