Problems hooking TV to iMac

I have an iMac, 21.5" (late 2009 model)
I have a Mini Display Port to HDMI Adapter
I have a 4 metre HDMI Cable
Plugged the Mini Display Port into my iMac:
Code:
http://i56.tinypic.com/wlc0p2.jpg
Plugged the HDMI into it:
Code:
http://i51.tinypic.com/2myzps3.jpg
Then plugged the other HDMI end into my TV:
Code:
http://i52.tinypic.com/2uhqngm.jpg
Switched the channel onto the HDMI 1 (which the Cables plugged into)
went on my iMac to detect displays, but nothing...
what am I doing wrong?
(first time doing this obviously)
All plugged in but when clicking on 'Detect Displays' it just does nothing, nothing happens... and on my LG TV it just says 'No Signal Detected' :-/
My TV picks up the HDMI because when all is plugged in, the HDMI 'tab' is highlighted (to click onto) but when the HDMI it taken out of the Adapter, the HDMI 'tab' goes grey... so the TV knows the HDMI is plugged into something to use, but the iMac isn't detecting the TV, and the TV just shows 'No Signal' on the Screen....
Im wondering could there be something wrong with the Adapter itself? but then again if something was wrong with it... the TV wouldnt know that it's actually plugged into something for the HDMI 'tab' to become highlighted.

I've got my new Neet wires today...
when plugging in the Neet Adapter and Cable, the TV didnt pick up a HDMI connection,
so i've plugged in the cheap Adapter I bought first with the Neet HDMI Cable and the TV picks up a connection, and the iMac flashes Blue a few times....
but still No Signal on the TV and the iMac doesnt 'detect' my TV!

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