I have a MacBook Pro 15 inch, 2014 model, with 2 GPUs: Intel and NVIDIA 750M.
Last Monday I turned it on and I noticed that the screen is white as you can see in the picture.
I don't know what is the problem with it. I tried some solutions that I found on the web like resetting the NVRAM & SMC without result. I tried also to deactivate the dedicated GPU using gfxCardStatus but also no result.
The problem is that when I keep the Mac turned on for some time (>2 hours) the screen goes back to normal without white edges.
When I turn it off and keep it turned off for a while, then turn it on again it becomes white again and I must wait >2 hours so I can see my screen without this whiting effect.
Can you suggest a solution? We have no Apple Store or Apple repair in my country.
I tried to use my Mac HDMI but it's not working too. It was working before I got this problem. The mini DisplayPort to VGA is still working.