External Display not being found

Hey i posted this under macbook display but no one really goes in there so can you guys help??
Hi recently i borrowed a friends official apple mini-dvi to video adapter to watch a movie with my macbook. He uses the cable with his iMac. I tried plugging it in, the screen flashes blue then nothing appears on the tv. no picture nothing. i tried restarting with it plugged in, restart without, putting it to sleep plugging it in then waking it and nothing works. so i thought maybe the cable is broken. so i go to my friend and we hook it up the same way i was with his iMac and it works so we unplug his and plug it in to mine and it still does not work. HELP???

Your display may not be on the "approved" list, or was removed from it.
Apple's new MacBook lines includes a form of digital copy protection that will prevent protected media, such as DRM-infused iTunes movies, from playing back on devices that aren't compliant with the new priority protection measures.
The Intel-developed technology is called High-bandwidth Digital Content Protection (HDCP) and aims to prevent copying of digital audio and video content as it travels across a variety of display connectors, even if such copying is not in violation of fair use laws.
Among the connectors supported by the technology are the Mini DisplayPort found on Apple's latest MacBook, MacBook Pro, and MacBook Air, in addition to others such as Digital Visual Interface (DVI), High-Definition Multimedia Interface (HDMI), Gigabit Video Interface (GVIF), and Unified Display Interface (UDI).
Apple has apparently acquired a license for the technology and is now using it across its DisplayPort-enabled MacBook lines to to prevent transmission of purchased iTunes content (and some DVDs) to devices that don't include support for HDCP.

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