Since upgrading to el'cap my monitors do not wake up.

Question

Level 1

14 points

Since upgrading to el'cap my monitors do not wake up.

Hi all. I have a late 2013 Black Mac Pro and have two monitors plugged in via display port. Everything worked just fine until I upgraded to el'cap awhile ago. Now, when the computer puts the monitors to sleep and I try to wake them up, they don't wake up. When I tap the keyboard or something, they power up but don't have a signal then go back to sleep. The only thing to do for me is to turn them (the monitors) off and then back on again. It was of course working fine until I upgraded. Anyone have suggestions before I go though the huge pain of a clean re-install?

Thanks

Lawrence

Posted on Feb 13, 2016 6:38 AM

Reply

Answer 1

CarlAVII

Community Specialist

Feb 14, 2016 11:44 AM in response to montivfx

Howdy Lawrence,

I understand that, after waking your Mac from sleep, you don't get a signal to the two displays you have connected. Fortunately the article linked below details a number of troubleshooting steps that can help restore proper functionality to your Mac and its displays.

Get help with video issues on external displays connected to your Mac
https://support.apple.com/en-us/HT201177

Sincerely

Reply

Answer 2

montivfx Author

Level 1

14 points

Feb 15, 2016 2:16 PM in response to CarlAVII

Went through all this and it still doesn't fix the issue. It literally worked before I did the upgrade, and then after I did the upgrade stopped working (worked and didn't work in the same day).

Thanks for the tips. Anything else?

Reply

Answer 3

CarlAVII

Community Specialist

Feb 16, 2016 6:34 AM in response to montivfx

montivfx,

Thank you for using the Apple Support Community. Due to the nature of your issue or question you may find more information by using another one of Apple's support resources - https://getsupport.apple.com/GetproductgroupList.action.

All my best.

Reply