as above:

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


Can you get hold of another one to compare - it sounds like you may have a broken one

If in warantee - talk to matrox. Ask for Rob Moodey at the UK office.

S