3 Replies Latest reply: Feb 15, 2013 3:46 PM by SwankPeRFection
jacob285 Level 1 Level 1 (0 points)

My mac works great in bootcamp with Windows 7, however, when I switch to the mac side the screen is black and is not even recognized.  I can only use it when connected to an external display.  How can I get my screen recognized again? I know it works, just don't know why it won't work for mac side and only works for windows 7.


MacBook Pro (13-inch Late 2011), OS X Mountain Lion (10.8.2)
  • 1. Re: MacBook Pro Late 2011 internal display is not recognized
    GeekBoy.from.Illinois Level 4 Level 4 (2,775 points)

    At first I thought you might have had a failure of your integrated video controller.  Windows will not make use of the integrated controller, and only uses the discrete GPU, so that would explain why your Boot Camp would work but your Mac wouldn't.  Then, I realized that you said that it will display on an external monitor, but not on the internal LCD under MacOS.  How are you connecting the external monitor?  It's possible that it might still be the integrated GPU which has failed, and the external monitor is forcing it to use the discrete GPU under MacOS.  You might try downloading gfxCardStatus and seeing if it is using the Integrated or Discrete GPU when using the external monitor under MacOS.  You could try forcing it to use the Discrete GPU and see if it will use your internal display that way.

     

    I would suggest making an appointment at a Genius Bar to have them take a look at it, especially if you are still under warranty.

  • 2. Re: MacBook Pro Late 2011 internal display is not recognized
    jacob285 Level 1 Level 1 (0 points)

    I downloaded gfxCardStatus as you suggested and it is working as discrete only.  I think that I may just have to wipe my computer clean and reinstall OSX again returning everything to factory defaults.

  • 3. Re: MacBook Pro Late 2011 internal display is not recognized
    SwankPeRFection Level 4 Level 4 (1,435 points)

    Look up how to do a PRAM reset.  Do that and see what happens after that.  Could be a goofy display preference that got stuck the last time you had an external monitor connected to it and went dual booting from one OS to the other before reverting back to the internal display itself.