Using the MB on-board 6100 VGA chip, no problem, it works. Using the PCIe 7600GS (DVI) with the default drivers (vesa), also works, BUT, when using the 7600GS (DVI) with the new NVIDIA (official) drivers, gives a nice black screen after the Ubuntu splash screen. Tried all "solutions" (pressed all the numeric keys and changed all the connections), and nothing solves this issue. Also followed some advice found in the forums (check logs, dmesg, etc) and did not see any problem or failure in the logs. Since the 7600 has more performance, I think it is preferred.
This is bugging me out. Since I started this because I wanted a better image quality/performance/geek factor from my media center (using Xbox+XBMC. It just works :-) )
Thank you for any help.