HT3924 2009 Imac as screen display for MBP retina dosnt work

I got an Imac 2009 - but when i try to connect it with my brand new 15" retina MBP - i dosnt detect the monitor. I use a HDMI cable with adaptors in both ends. Anyone know what to do?
Krogh

HDMI won't work.
Here's how it's supposed to work...
http://support.apple.com/kb/HT3924

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