In my situation - I got the pink tinged screen on my laptop when plugged in. On battery it wasn't there and on an external monitor it wasn't there. Ran a barrage of tests from Dell on it. Nothing worked. Tech support could not fix this and wanted me to send in my computer. My husband had me go to the toolbar on the bottom of the screen (click on the carrot/up arrow), locate the "True Color" icon, and DISABLE it ! Worked immediately!