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I cannot connect my MacBook Air to an external monitor. But I am able to connect it to a projector, without any difficulty. My computer detects the external monitor but cannot connect to it. The screen is just black

  • I have tried everything in the System Preferences > Display > Resolution category. Does not work, but any clue will help!
  • I have upgraded everything on my Mac, so that it is now OS X El Capitan.
  • I have tried to deconnect and reconnent the cable connecting to the screen.
  • Other MacBook Air work with the monitors I want to use, and they all work.
  • I have tried the sleep-mode to get it to detect the mac/screen.
  • I have tried changing the VGA cable.

I have tried almost everything, what am I missing?

  • Are you connecting using 100Hz for example on a 60 Hz monitor? Does a different monitor work? – Rob Mar 14 '16 at 11:00
  • I have tried with 2 different monitors and it is the same problem. I was suggested by apple support that it might be a software issue, but I dont know what kind of software that should be? And I dont know how to find out about the 60Hz and 100Hz :/ – Nine Mar 15 '16 at 8:48
  • It appears to be 60Hz! found it :) – Nine Mar 15 '16 at 9:08
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Are you connecting using 100Hz for example on a 60 Hz monitor? The monitor will turn black then and appears to be disconnected. There should be an option to cast it as a different Hz to your monitor.

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