Second monitor not detected

[billyb]

I have installed sierra on my hackintosh and I have two screens a benQ 1080p monitor and an lg 34uc87c 1440x3440 ultrawide. The benQ is connected via VGA to my 750Ti graphics card which is detected and works at full resolution. However my ultrawide is not detected in the OS, which i have tried connecting by DVI to HDMI and HDMI to HDMI but it is not detected. I have tried unplugging the benQ and booting with the ultrawide, which shows the apple logo boot screen but after that goes black and says no signal detected.
I have the nvidea web drivers installed and working.
If anyone has any advice i would appreciate it
cheers, Billy

 

[aol]

I have installed sierra on my hackintosh and I have two screens a benQ 1080p monitor and an lg 34uc87c 1440x3440 ultrawide. The benQ is connected via VGA to my 750Ti graphics card which is detected and works at full resolution. However my ultrawide is not detected in the OS, which i have tried connecting by DVI to HDMI and HDMI to HDMI but it is not detected. I have tried unplugging the benQ and booting with the ultrawide, which shows the apple logo boot screen but after that goes black and says no signal detected.
I have the nvidea web drivers installed and working.
If anyone has any advice i would appreciate it
cheers, Billy

What SMBIOS are you using? The MacPro 6,1, iMac 16,1 and iMac 17,1 (I think that's the list) seem to require the AGDPFix in order for the second monitor to work, I think regardless of video card, because something in the OS disables the second output. Does either monitor work as the only single monitor - can you unplug one and plug in the other and have it work? In my personal situation I have to boot up with one monitor plugged in, and turn on/plug in the second monitor once I reach the desktop. But I'm on the internal 530 GPU, I didn't think dual monitors was as much of an issue with discrete GPUs.

 

[billyb]

I'm using SMBIOS of MacPro 5,1
If you think AGDPFix will still help please can you explain how to do this?
The first monitor will boot and run, the second one will boot if it is the only monitor plugged in but then the signal is lost before the login screen. I have tried booting with the second monitor unplugged then plugging it in but no luck.
Thanks, Billy