The graphics tablet that is hooked to my Sapphire 2000 is powering up and appears to be functioning by way of the led's on the tablet. However, the tablet does not seem to be talking to the desk. Any insight on what might be wrong?

I have been trying to get a price on Sapphire 2000 submaster fader boards and submaster faders. I have been hitting a brick wall. As there is currently no U.S. Avo dealer it seems that I can't even get a price on these parts let alone order them so I can take care of my customer! This is getting ver...