i have a macbook pro retina with OS X 10.8.4 (12E55) , and i'm connecting it to a dell u3011 monitor using a mini-display to displayport cable , it was working great until today whenever i connect the cable my monitor goes to energy save mode , i thought this was a cable problem so i bought a new one and the problem still remains , i connected to the monitor using HDMI and its working fine , is it a video driver problem?

  • are you on battery power ?
    – Ruskes
    Commented Jul 25, 2013 at 23:35
  • no , not on battery power Commented Jul 25, 2013 at 23:35
  • sorry for been late :) so how did you tell your MBP what to do when you plug in external monitor, so it does not run off the build in one !
    – Ruskes
    Commented Jul 27, 2013 at 20:08
  • it works out of the box when i connect the cable , no need for configurations Commented Jul 28, 2013 at 0:55
  • Well,, check your energy save settings n the system preferences anyway.
    – Ruskes
    Commented Jul 28, 2013 at 7:37

1 Answer 1


Incredibly late answer, but I had the same issue and what worked for me was to reset the NVRAM.

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