To answer your question:
a) installed the linux drivers available from nvidia, or are you still using the default drivers?
I'am using default drivers. I'm a linux newbie, I havent installed any linux drivers yet at nvidia. I'll be very thankful to anyone who could teach me how.
b) did the video output work for graphical boot and install process, and only after rebooting stop working?
The video output didnt work for graphical boot and install process as well so I just use the linux text in installing linux.