I have a Toshiba Satellite L675d laptop. I have had it for about a year and it has done this from day 1. It will be normal for a little while then places that should be black will turn green and places that should be white turn pink.

It has been sent to Toshiba who claims there is nothing wrong with it the first time and that they fixed it the second time.

It doesn't do this all the time just randomly. Sometimes if you tap it the screen goes back to normal.

Any ideas what could be wrong with this thing?