Check nvram with this :nvram -p
You should have boot-args="nvda_drv=1" in it. If not, type this then reboot :sudo nvram boot-args="nvda_drv=1"
I did as you say pc boot i can see that it reach until loading nvidia driver and screen turn black look like system is up but can't see image..
I use GTX 750ti
when not using the arg system boot but cannot recognise the card, using inject can recognise the card with 0mb and not really working
looks like i can't choose NVIDIA driver in the panel after restart it changed back to Mac driver... any help?