IMac monitor as cable display

Can I use the 27 in iMac monitor as a display from my Oceanic cable box? COAX cable from wall to cable box, HDMI from cable box to iMac with use of an adapter?

OK. I have not purchased the iMac yet, but one of the main functions I will need from it is to use it as the main monitor from my cable box. I called Apple Support and they were not helpful, just said "probably not".
If I get a HDMI to minidisplay port cable would that work? HDMI in the cable box and then minidisplay port into the back of the iMac.
Thanks for responding.

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