How use Mini DisplayPort "in" on new 27" iMac?

I just bought a new 27" iMac (woo hoo). As I understand it, the Mini DisplayPort can receive a signal "in" in addition to sending one "out".
I have a Wii that I would like to plug in and use the iMac for display (and hopefully sound). The Wii has 2 kinds of output... Red/White/Yellow RCA plugs, and Red/Green/Blue RCSA plugs. I think one is called "composite" and the other "component" but I'm not sure which is which.
What kinds of converter cables do I need to buy to get one of these signals into ultimately Mini DisplayPort in?
Thanks.

rcook349 wrote:
I just bought a new 27" iMac (woo hoo). As I understand it, the Mini DisplayPort can receive a signal "in" in addition to sending one "out".
I have a Wii that I would like to plug in and use the iMac for display (and hopefully sound). The Wii has 2 kinds of output... Red/White/Yellow RCA plugs, and Red/Green/Blue RCSA plugs. I think one is called "composite" and the other "component" but I'm not sure which is which.
The Red/White/Yellow is composite. The yellow is the video signal, the red and white are audio stereo left and right channels. Both use analog signals via RCA plugs. As does the component cable. As Kenichi said, not aware of a solution to go from these cables to digital mini-DisplayPort, but if found, it would be expensive since it's not just a cable/wire conversion but a signal change from analog to digital etc. Sorry, but enjoy the Wii on TV.

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