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.

  • Start off by booting into Safe Mode and see if the problem persists. Also try running AHT - Apple Hardware Test. Hold D while booting from a powered off state with the AC adapter attached. – Allan Dec 18 '18 at 13:04

According to this Apple discussion:

The problem is that the expose window is stuck. In order to force a refresh take these steps:

  1. launch terminal
  2. type killall Dock
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  • It's no longer Exposé - it's Mission control; but given that HDMI is also no longer working per the OP, it's highly doubtful a restart of the Dock will resolve the issue. It's more likely a hardware problem – Allan Dec 18 '18 at 13:25

This computer is slow, and can't keep up with the app. Click and hold the app Chrome, or Safari, or Fire fox. Press quit,then wait for a few seconds, reboot. There you are, this should work!

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  • That seems to be a rather wild guess, a MBP from 2014 is perfectly able to handle the load coming from a few browser tabs. – nohillside Dec 18 '18 at 20:21

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