Some of Apple's computers have Apple-specific connectors, with the relevant adapter cables being available to convert to DVI.
We have found an compatibility issue with the Apple Mini DisplayPort to DVI adapter, when used with the C2-7000 series. No other C2 units appear to be affected.
There are two solutions available:
1. Switch to using the Mini-DVI port instead (as shown above) if this is available - this has been tested and works fine.
2. Obtain a "Cablesson MacKuna Mini DisplayPort Adaptor to DVI". This has been tested and found to work fine.