If the mac states that it is running that resolution - then it would seem that it is seeing the TH2G. Are you using a dual-link cable?

What else do you have connected to your system
What spec is your Mac and graphics card?
Is this new or hired?

Can you login to the mac via screen sharing from another Mac and see what is on the screen?

How long are your cables from the TH2G to the Monitor or Projector?
Do they connect to any other processing kit or are they direct?
What is the refresh rate?

Can you send a screen shot?

I use TH2G all the time and they are usually fairly simple to set-up and work most of the time
(unless you have a broken one)


S