[SOLVED] Can't boot with dual monitor setup on GTX970

[realfolkbluesx]

What SMBios are you using? Try MacPro 5,1 or iMac 14,2.

 

[slim.jim]

What SMBios are you using? Try MacPro 5,1 or iMac 14,2.

MacPro 5,1 will introduce more issues relating to ECC Ram.

 

[DuckThom]

Not sure about the other problems, but for the reboot issue during startup while dual monitors connected to GTX 970, I found my solution here is to change smbios from iMac12,2 to iMac14,2,

I have both monitors connected to DVI ports, Dell 3008WFP @2560x1600 and Dell 2001FP @ 1200x1600.

Hope this helps.

Thank you very much, changing iMac12,2 to iMac14,2 fixed the reboot issue for me. ^^

 

[MessyMass]

I had the same problem. If you have AppleGraphicsDevicePolicy patch in Clover config.plist (Kernel and Kext patches) remove it. This fixed the issue for me.

 

[Cektor]

Thank you, MessyMass! Now I can boot my machine with any port combination I have. dvi-hdmi, dp-hdmi, dp-dvi, dp-hdmi.
BTW, I'm using MacPro 6,1 on SMBIOS

 

[geniium]

@MessyMass : that did not work for me with ASUSZ170 Pro Gaming and GTX 970.

 

[GMarz]

I was having a similar problem with 2 4K monitors and 1 HD on a GTX 960, what finaly solved it was disabling CSM in the bios. I have a gigabyte UEFI bios and apparently under bios settings select OS, if you select "Other OS" it defaults to CSM on. So I had to change the OS to Windows 8, then the CSM option becomes available and then I disabled it. Booted with the 3 monitors without issues.

 

[MortySmith]

I had the same problem. If you have AppleGraphicsDevicePolicy patch in Clover config.plist (Kernel and Kext patches) remove it. This fixed the issue for me.

Hello, I disabled AppleGraphicsDevicePolicy and I got a blackscreen.

Disabling CSM didn't work either.

Do you guys have inject intel on ?

 

[phouphi]

I have gigabyte z170x ud5 th with GTX970, and I have the same problem : no problem with one monitor, and if I plug the second monitor after the boot, it works perfectly, but if I boot with 2 monitors, black screen after apple logo on the 2 monitors.
I'm with IMac14,2 SMBios
I have tried to change CSM option in the Bios, I don't have AppleGraphicsDevicePolicy in config.plist...
and I have no more idea to test...

First monitor is HDMI and second with DVIDVI cable...

please help !

 

[miquedique]

I have the same exact problem. One monitor boots, the second is black. I have to turn it off and then back on to get it to work. It's very annoying...