I install Windows 7 on my system:
AMD 64 - 3600 x2
Gigabyte NV 8600 GT 512ram
LCD 20" connected to primary dvi port
Projector InFocus LP120 connected to secondary DVI port
And i can`t get picture on My projector connected to second DVI out
in all configuration - Extend Desktop, Clone Desktop, One Desktop etc
also i try swap DVI cable, and DVI ports
one result - Projector say - "No signal"
I try drivers for Video card:
on second system (Vista)
with Gygabyte drivers - projector work good
Try uninstalling whatever driver you're using now and install the latest drivers from www.nvidia.com. Did you Also, is the monitor and the projector connected before you boot up the computer? Is the Screen Resolution panel showing both monitors being detected?