Connecting a second monitor to a iMac27

I have a problem with my new iMac27 displaying through a second monitor.
The second display monitor is a Samsung Syncmaster 225BW.
I 'm using an Apple Mini DisplayPort to HDMI Adapter cable out of the iMac and connecting to the second display via an HDMI cable to a DVI-HDMI adaptor.
When I go into Monitor Settings it shows the second monitor okay but there is no display showing on the Samsung monitor.
To test the cables and setup I connected the same cable setup into my MacAir laptop and the display shows up okay on the second monitor confirming there is nothing wrong with the connectors.
Can anyone kindly help?

for me this almost sounds like it could be a damaged mini display port on your imac. normally attaching a second monitor is just plug&play. and since you say OS X is correctly recognizing the display, this could be MDP/graphic card issue. is the imac still under warranty? if so, you might wanna call the apple support and if they know nothing then you will probably have to give your imac into repair

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