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[SOLVED] iMac14,2 GTX980 with 3 monitors boot to black

Joined
Aug 19, 2012
Messages
7
Motherboard
Asus Sabertooth X99 X2011V3 / 32GB DDR4
CPU
Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
Graphics
PHANTOM GEFORCE GTX 980 4GB GDDR5
Mac
MacBook Air, MacBook Pro
Mobile Phone
Android, iOS
Hi,
I want to add some monitors...

Currently under 10.12.3 everything is working with one 2560x1440 display (connection DVI-DVI)

But if if plug another monitor (1920x1440) with a miniDP to DVI cable the system boots but I get black screen on all two monitors.
The system is reachable via ssh.

Same appears if I use a miniHDMI to HDMI cable or miniHDMI to DVI cable.

The more strange is:
If I boot only with my main monitor, and when I get the login screen I plug the two other displays… It works perfectly!
 
Joined
Aug 19, 2012
Messages
7
Motherboard
Asus Sabertooth X99 X2011V3 / 32GB DDR4
CPU
Intel(R) Core(TM) i7-5820K CPU @ 3.30GHz
Graphics
PHANTOM GEFORCE GTX 980 4GB GDDR5
Mac
MacBook Air, MacBook Pro
Mobile Phone
Android, iOS
Enable CSM in bios.
THANKSSSSSSSSSS……
I've changed from "CSM-Disabled" to "CSM-Enabled" (options were disabled/enabled/auto)
It works well.
 
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