I don't know if anything will help or not.  It has 2 different NVidia cards running 2 DVI, 1 HDMI, 1 VGA, and 1 unused HDMI.  It works on FC22 from the install disk on.  Breaks on abi going to fc23.  Here are the log files.  The system was in such a state, that a do not want to go back there again.  I reported this a while back but did not gather anything because I was in need of getting back and running immediately.