PS3 on iMac

Hiya all

I have an iMac 27 inch , I bought a Cable MINI display port to HDMI ,
I insert the HDMI in to my decoder for watching TV and this all works

But when i try the same thing with my PS3 it doens't work ...??
any1 know's an answer ?

I use the Secondary screen of the iMac

thx nution

Check this out: Kanex XD - HDMI® To Apple iMac 27" Apple LED Cinema Display 27-Inch - Full Screen HD Playback

Kanex XD review: your 27" iMac now plays nice with your PS3 Here's a review of it.