Problems connecting to external monitor

Hi, ive just purchased a imac this week and one of my first tasks is connecting a external monitor to watch my films on. Ive watched a few youtube tutorials on how to do it and it seemed easy, the items i have are:
1, Hdmi Cable
2, Mini displayport to Hdmi adaptor
3, 32 inch samsung 1080p hdtv
So i connected the hdmi cable to the hdmi2 socket on my tv, i then connected the hdmi cable to the mini display adaptor and then connected the adaptor to the mini display port on the back of my imac, so now according the videos on youtube, both monitors are supposed to flash blue and then the display will appear on my tv. But absolutely nothing happens, my imac screen doesnt flash blue, and my tv still says "HDMI 2 - No signal".
So im stuck know on what to do next, i tried changing my screen resolution to a lower resolution on my imac just incase the tv wouldnt pick the signal up becuase it was too high of a resolution but that hasn't worked.
I know its not my tv and its not the hdmi lead as i connected it to my xbox360 and it worked fine. My first suspicions were that the adaptor was faulty, but i disconnected the wire and removed the adaptor from the back of the imac, i then attached the adaptor back to the hdmi cable ( while not attached to the imac) and the tv went completely blank for 3 seconds and came back to "Hdmi 2 - no signal" So im guessing the adaptor isnt faulty?
Any suggestions or help on this subject would be great!
Thanks
Message was edited by: Kiz5000

Have you tried resetting the PRAM?
Reset the PRAM
• (Re)start the computer
• Immediately press & hold the CommandOption+PR keys
• Wait for two startup chimes
• Release the keys and allow the computer to boot.
Also Apple suggests that you always turn on the display/TV first before turning on the Mac so that the Mac gets a good read on the display's identification of itself to the Mac. I would power down both devices and connect all of the cables. Then power up the TV and lastly power up the Mac.
Dah•veed

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