I recently bought a mid 2012 15 MBP 16gb 768gb ssd and I recently got this when booting up and opening the lid after being in sleep mode for an extended amount of time. Is this a bad dGPU or loose LCD cable? I plan to go to an Apple Store to see an Apple Genius for repair. Bascially I see the dock going up and down quickly for an extended of time. This happens when getting out of sleep mode after an extended amount of time & when booting up the Cancel & Guest button does the same thing and there's a line on top of the duck that disappears. What do you folks think it is? Also, should I un-encrypt my SSD before I take it back for repairs?