Pulling my hair out trying to get my 980 Ti to work with Yosemite. Would really appreciate some help.

I had a rock solid Yosemite (10.10.5) install on my Z97x UD7 TH with 4790k and GTX 770.

Upgraded to a 980 Ti and it broke booting into OSX at all with it installed in my desktop.

With the 980 Ti installed

I can't boot with the flag "nv_disable=1".

I can't boot with "nvda_drv=1"

I can't boot with "UseKernelCache=No"

I can't boot with Single User Safe Mode

With the 980 Ti removed

I can boot with "IGPEnabler=Yes"

I've also updated the Nvidia Web Drivers, removed the AptioDrvFix.efi from the EFI folder and replaced it with the AptioDrv2Fix file.

I could really use your help!!!

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