Currently Being ModeratedFeb 22, 2013 11:56 PM (in response to Mick82)
Is it the Apple version of the DVI to ADC adapter? The signals from a Mini DisplayPort (or Thunderbolt) to DVI adapter may be weaker than normal DVI signals. The Apple DVI to ADC adapter amplifies the DVI signals, so can work with signals that are too weak for non-Apple adapters.
An ACTIVE Mini DisplayPort to DVI adapter may produce stronger DVI signals.