Sorry for yet another "Hey, it's all broken!' thread, but here goes anyway.
Since I attempted to update to High Sierra, I'm unable to do anything other than boot into recovery mode via Clover 4359.
Even then, I can only get it to boot if I drop the MATS & DMAR tables from within Clover (this...
You know when you just wished you'd left things alone?.. well that..haha
Ok, I had (until this morning) a fully working Customac, using an nVidia GTX760.
I've just upgraded to a GTX970(Haswell chip) as apparently these are now fully supported with the new nVidia webdrivers etc.