I downloaded OS X El Capitan and now my Mac Pro can't find my other 2 monitors (I have a Mac Pro desktop). I tried auto detecting the displays and also manual detection but it can't find the other displays. Is anyone else having this problem? Feels like a firmware problem.
Mac Pro (Late 2013), OS X El Capitan (10.11.1)
What specific monitors and how connected?
- Try resetting the SMC and NVRAM/PRAM
Intel-based Macs: Resetting the System Management Controller (SMC)
Dell S2740L
Connected by HDMI and HDMI-Thunderbolt
Updated from what OSX version?
So you have three monitors connected via HDMI?
One via the HDMI port on the Mac and two via a mini displayport>HDMI adopter?
Are the adopters active adopters?
Connect more than two DVI or HDMI displays
Mac Pro supports a total of two DVI or HDMI displays when connected via the built-in HDMI port or using the Apple Mini DisplayPort to DVI adapter. To connect additional DVI displays, use an active DVI adapter like the Apple Mini DisplayPort to Dual-Link DVI adapter. You can connect up to six active adapter DVI displays. This requires a powered USB hub since Mac Pro offers four USB ports and you need six USB ports to connect the Dual-Link DVI adapters.
OS X El Capitan
1 - HDMI direct
2 - HDMI to Thunderbolt adapter
3 - VGA to Thunderbolt adapter
I think my prior OS was Yosemite and it worked before.
I reset the SMC and PRAM and I still have the same problem. Its strange that I never had this issue before I updated the OS.
Some users with multiple display problems have said their problems were cured by turning OFF "displays have separate spaces" in Mission Control in El Capitan. This turns the screens into one big extended desktop, with one menuBar only on the Primary display, like this picture:
.
Thanks. That seems to have worked!
It seems to have only worked temporarily. Now its completely random. Sometimes when I boot up the computer it works and sometimes it doesn't. Any suggestions or should I just bring it into an Apple Store?
Mac Pro Multiple Screens
