Home Theatre and iMac 27" display NOT working

Ok, I bought an iMac 27" (MC511T/A). It does not have Thunderbolt port but the old good mini DVI.
What I'm trying to do is using its stunning display as an external video for my Home Theatre System.
From the Home Theatre > HDMI into DVI > DVI into Mini DVI > iMac
It doesn't detect anything at all.
Any guess?

First, your iMac has a MiniDisplayPort not a DVI-port.
Second, for Target Display Mode (as Apple calls it) the iMac only accepts DisplayPort-compliant signals which HDMI is not.
HDMI is comparable to DVI.
Therefor your connection doesn't work.
What is Target Display mode?
Kanex has a HDMI converter http://www.kanexlive.com/xd
Stefan

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