Macbook Pro (late 2016) suddenly stopped detecting my external monitor after a 3h hibernation after working flawlessly for two weeks.

I've verified that my monitor works fine with my Windows PC.

I'm running MacOS High Sierra 10.13.6 which I updated to August 18th.

I'm using a USB-C to DisplayPort cable which will wake up my monitor from standby mode, but my Macbook Pro still can't detect it. Display in System Preferences gives me nothing and Options revealing Detect Screen doesn't yield any results either.

I've followed the official troubleshooting (including reset of NVRAM and SMC) without results.

I'm guessing that maybe my cable is defective, but then, why would it wake up the monitor?

  • Have you tried just disconnecting and reconnecting the monitor?
    – Allan
    Aug 30, 2018 at 18:17
  • @Allan Yes, that was part of the official support docs.
    – MdaG
    Aug 30, 2018 at 18:34
  • What cable are you using? Is it a USB-C adapter or just cable?
    – Allan
    Aug 30, 2018 at 20:37
  • @Allan Just a cable with usbc on one side and display port on the other. I.e. both ends are male.
    – MdaG
    Aug 30, 2018 at 20:38
  • If you reboot, does it start to work?
    – Allan
    Aug 30, 2018 at 20:55

1 Answer 1


This was resolved by buying a new cable. This cable was a USB-C to HDMI.

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