3rd Monitor issues

Just rebuilt my machine last night using the Sierra guide and have everything working except my third monitor. Using GTX970 display port and 2 DVI ports. Using the imac 14.2 defs i was able to get the system to boot and working with the display port and one of the two DVI's. Searched the forums for hours and havent found a solution yet. Any suggestions or links would be appreciated everything else seems to be working well.

Thanks everyone.

Update
Appears to be an issue with the DVI-D...

3rd Monitor issues