EVGA GeForce GT 740 not working well in El Cap

[tanderson92]

dual link dvi works too.

the 740 is a good card, you should have zero problem with it.

I wish that were the case. My problem level is sadly nonzero.

 

[JDChristensen]

I wonder if your 740 could be bad? I have a DVI to an older monitor, top res 1600 x 1200, and out to an HDMI (UHD) tv, which can do past 4000 x what ever. The 740 will drive either just fine. No Web drivers needed. If I end up getting a monitor which can have higher res, I can have the same UHD res on both the monitor and UHD TV at the same time. I don't think the 740 puts out different res for the DVI and HDMI at the same time.

 

[tanderson92]

I wonder if your 740 could be bad? I have a DVI to an older monitor, top res 1600 x 1200, and out to an HDMI (UHD) tv, which can do past 4000 x what ever. The 740 will drive either just fine. No Web drivers needed. If I end up getting a monitor which can have higher res, I can have the same UHD res on both the monitor and UHD TV at the same time. I don't think the 740 puts out different res for the DVI and HDMI at the same time.

If it is bad, it went bad right as I upgraded from Yosemite to El Capitán. While not outside the realm of possibility, it seems unlikely. I hate to start throwing parts after this problem, but maybe I can borrow one of the NVIDIA cards from my Windows SLI to see if it works better.

Edit: I finally dug up a DVI cable, and with it plugged in to either DVI-D or DVI-I I get a pink screen with bad static and the screen rolling. Either the brand new cable I used is bad, or maybe the card has gone bad after all.

 

[maddizzar]

Thanks, I've tried suggestions from that thread without success. According to the chart linked from that post, my 0x0fc8 card should work with or without NVIDIA drivers, with injection off. I just went through the combinations anyway to see if anything helped, and nothing did. With no injection and OS X drivers, OS X thinks it's a 1280x1024 projector, and the screen redraws instead of scrolling. With OS X and injection, it reboots. With NVIDIA web drivers and injection, it reboots. With web drivers and no injection, my monitor is detected as a 1080p TV and it seems to look fine except the resolution is wrong (ie, the screen actually scrolls when I scroll instead of visibly redrawing).

In safe mode, the display is detected at the proper 2560x1440 resolution, but as I mentioned the screen redraws when I scroll and move around. I wish I knew the proper term for that, but that's how it looks. I'm trying everything I can to find the proper combination that allows 2560x1440 and a normal boot. The fact that it detects it fine in safe mode means something is loaded in normal mode that makes the computer think my monitor is a TV. I wish I could figure out what...

Same problem...solution here
https://www.tonymacx86.com/threads/...-sierra-coredisplayfixup-1-3-lilu-1-2.233382/