To synchronise my system to a house sync
Connect the external sync source to the House Sync BNC connector on the NVIDIA Quadro G-Sync, NVIDIA Quadro Sync, or the NVIDIA Quadro FX 3000G.
The House Sync LED on the graphics card bracket should turn green to indicate that the hardware has detected the house sync timing signal.
NVIDIA Quadro FX 4500/5500 SDI: An occasional red flash is OK, but a steady red LED means that the hardware cannot detect the house sync timing signal. Check the signal source and correct the problem before proceeding.
NVIDIA Quadro FX 4600/5600/4800/5800 SDI: No LED light (grey) means that the hardware cannot detect the house sync timing signal. Check the signal source and correct the problem before proceeding.
From the NVIDIA Control Panel Select a Task pane, under Workstation, click Synchronise Displays.
Under The timing server, click the On this system radio button.
Click Apply.
Normally, the software automatically detects the signal type that is being used. If the driver fails to detect the signal type, you can force the software to detect the signal type as explained in House Sync Signal Detection.