GO FLIGHT GF-MCP AUTOPILOT problems

Hi Folks.
I have the above autopilot, and the IAS/MACH button does nothing, and won't light up? Other functions seem ok, but I really need IAS as well. I am flying a Twin Otter.
Is there something I should be doing within the cockpit, or the PC to make this work?
I am hoping that I won't have to buy another autopilot! If I have to, is there anything on the market at a reasonable price?

Here's hoping.

TONY Plymouth UK

Tony,

Be sure you ha ve the latest firmware installed. You should see an "A25" upon power-up. And check that you have the latest drivers from GoFlight. Lastly, you may consider shipping it back to GoFlight for a checkup. They seem to have very good pricing for hardware repairs.

Cheers
Keith