How do I enable HDMI output on Nvidia GTX 650?

view story

http://askubuntu.com – I just built new PC: AMD 8350 CPU ASUS sabertooth motherboard Nvidia GTX 650 graphics card Ubuntu 12.10 System boots fine and desktop is fine using VGA connection, but there is no HDMI video output to the monitor (HP w2207h) using the Nouveau drivers. Tried a second other type of monitor with HDMI and had the same thing "NO SIGNAL". So I used "System Settings" and changed from Nouveau driver to NVIDIA Proprietary but still have "NO SIGNAL" from the HDMI port. On both monitors I did press the on screen menu to attempt to switch the HDMI port but on both they just time out and display "NO (HowTos)