Original post by: Scott ,
if your screen is grey, as in monochromatic, you can fix that by changing the settings in the subpanel "Screen accommodations you can get there by following the steps as follows; Settings, General, Accessibility, Screen Accomodations if your screen is a blank panel of grey, you may very well have an image failure. in which case, it could be a couple things. Most likely, this will require a screen replacement, however there are other things it could be. a GPU failure in the board, a disconnect in the LCD connectors, a damaged LCD connector, or least likely of all, a software failure.