Salix OS

I have been using Slackware/SalixOS since 13, however since 14.1 (only during boot) and now 14.2 has the same issue, which is a garbled loading screen. On 14.1, it disappears after almost at login. On 14.2, it just stays garbled and then I get nothing usable. My machine is MacPro5,1 (2012) hex core, EVGA Nvidia GTX680 Mac Edition. I never have had this issue until 14.1 release and other distributions at this time, assuming this is xorg/video related get a blank screen.
I am unclear what the issue may be and since there is nothing I can do to get a screen at this point, can anyone shed some light? Have had similar issues?

Thanks in advance for any direction or assistance, as it is appreciated.

How are you booting on the Mac?