NVIDIA GeForce GT 120 recognizing two displays but not able to see video through DVI, only mini display port. I've switched monitors, ports and still my 2009 Mac Pro recognizes both monitors but will only feed the mini display port, even if I only hook up 1 monitor. Any ideas?
Mac Pro, OS X El Capitan (10.11.6)
DVI wider than about 1920 wide requires Dual-Link DVI cables all the way through. Standard cables are Single-Link, and sometimes do not produce a picture on a high-resolution display.
Cables with pins de-populated from the central grid can only do up to 1920 wide, but the reverse is not always true.
The best "straight replacement" is an APPLE-firmware 5770. There is also several different PC-firmware 5770 cards out there, so you need to be super careful about what you are buying. The 5770 requires one 6-pin Aux-power cable (often not supplied).
you could have a damaged pin on the GPU or the cable
reset the NVRAM
How to reset NVRAM on your Mac - Apple Support
try another cable
I tried everything above and it did not fix my problem. Any recommendations on a replacement card? Just need two displays, nothing fancy for gaming or anything like that. Cheap is good lol
NVIDIA GeForce GT 120 recognizing two displays but not able to see video through DVI
