Please HELP: Motorola cable box won't play nice with 27" iMac miniDP IN port!?

in Current Mac Hardware edited January 2014
hi all. I really hope someone can help me with this. I gave my HDTV away to a friend in need so for now, I'd like to use my new iMac as a pseudo-TV. The mini DisplayPort on the 27 inchers allows for both audio and video to flow both IN and out of the iMac, so what do I need in order to get this working? What kind of software will I need to use?

I'm connecting the cable box through its HDMI port and on the other end I have attached the (quite pricey) HDMI-to-miniDP adapter. Do I still need some kind of tuner? My cable box is brand new and also has FireWire, USB, and Ethernet ports.

How can I get this going? I did a LOT of searches, but to avail. Please help...
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