The appearance has gone into a "negative print" look for all windows, web, pictures etc. No changes were made to settings.

15" MacBook Pro from 2008.
Working fine this morning and then shut the screen. After lifting 30 mins later the appearnce has all gone in to "negative" style. Have tried shutting down and restarting but with no change. I have tried changing appearance settings. No luck.
On startup all colours look normal and then it switched to a negative look. I also checked for updates and there were some so I ran them. Interestingly when running the update the background was standard Mac "space" and all colours were correct. That suggests to me that the screen is OK but something is telling it wrong color instructions (sometimes).
All other functions seem to be working ok.
Can't attach a screen shot using Grab because this chat says throws up an error - "content not allowed". Its a tiff file?
Any suggestions welcome.
Rob.

Go to System Preferences>Accessibility and make sure that "invert colors" is not turned on:
It won't show up in a screenshot...
Clinton

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