My late-2011 MBP has its view getting crazy from time to time. It is the model which is equipped with AMD Radeon HD6770M. Was working without issues for years, also when connecting a second display. I'm also running it's fan on a higher than normal speed to keep it from over-heating, but I only got it for less than 6 months (bought it second hand). The bad graphics first showed up when rebooting, then I kind of "solved" it by long pressing the power button and loading Sierra in safe mode. Then it went bad again when I connected a second display... I noticed that if it is set to the Intel GPU, there's no issue, but when I change it to the AMD (using gfxCardStatus), it becomes corrupt again... Is there any cure to this that I can do myself (I'm an electrician and knows soldering etc.) Thanks !