No 2nd display on Asus GeForce GTX660-DC2-2GD5 after installing macOS Sierra

[charlesstricklin]

I've just finished a clean install of macOS Sierra (I was using El Capitan previously) and I've run into two problems, but I'll only discuss the video problem here, since that's forum-specific to here. Since installing macOS Sierra, I do not get any signal on my 2nd display any longer.

For reference, this is my current rig:

• GIGABYTE GA-Z77-DS3H rev 1.1 motherboard, has an audio codec of ALC887
• 3.40 GHz Intel i5 Ivy Bridge Quad Core processor w/256 K L2 cache/core, 6 MB L3 cache
• Antec EarthWatts EA650 650W Power Supply
• 2 x CORSAIR Vengeance 8GB 240-Pin DDR3 SDRAM DDR3 1600 (PC3 12800) Desktop Memory totaling 16GB
• Asus GeForce
  GTX660-DC2-2GD5
  video card (connected using the 1 x DVI-I & 1 x DVI-D ports)
• 128GB Samsung 840 PRO Series SSD
• 3 x 3TB WD Green WD30EZRX 3.5" Internal Hard Drives IntelliPower 64MB Cache SATA 6.0Gb/s
• 2 x BenQ GL2250-T displays

When I ran MultiBeast - Sierra 9.1, under System Definitions I chose iMac 14,2. I have downloaded and installed the NVIDIA Alternate Graphics Drivers for macOS Sierra 10.12.6, and although they greatly improved my resolution, they did not give me back my missing display. I've checked my connections.

I am ay a loss to understand why I still have no 2nd display. Would anyone assist, please?

 

[ConteMario]

I found out that a second display does not work UNLESS you iMac14,2. Change the model. That is my finding.

 

[charlesstricklin]

I actually got everything working, about 2 more installs after I posted this post, but thanks!

Is there a way to somehow mark this question/issue answered, so it doesn't take up anyone's time reading it?