Posted By: FAQster Everything is in shades of gray, no colors - 03/11/10 02:18 PM
If what you see on your Mac isn't in color anymore, or in other words everything's in shades of gray like a black and white photo, probably the display has been switched to grayscale. To change it back, open System Preferences > Universal Access > Seeing and uncheck Use Grayscale.

Written by jchuzi with contributions from cyn, dianne and Hal Itosis in Changing display from grayscale.
(Note: you must be logged in to read the development thread.)
© FineTunedMac