MacBook pro issues

["andy"]

Hi , I sold my 2011 MacBook pro and the buyer after a few weeks has sent me these images of something that happens when it wakes from sleep on occasion ?

Anyone seen this or have any idea what could cause it ? I've said I will take it back because i regret selling it anyway and am assuming something my warranty will cover ?

Cheers

http://img573.imageshack.us/i/imagebch.jpg/

 

["andy"]

Yea it's a 13 with the integrated intel graphics . Lots of horizontal black and white lines and clouding , then they go away if the lid is shut and reopened for a second or third time