Macbook not recognising receiver

Hi folks,
I'm using a MiniDisplay to HDMI cable, to try to connect my MBP to my Denon Home Theatre Receiver.
I'm connecting the cable to the Thunderbolt connection on the MBP, and Blu-ray input on the HT receiver.
The Mac is not recognising the receiver as a display, nor an audio output.
When I use the same cord to connect the MBP to HDMI input on my plasma TV, it works fine. So that eliminates the cord as being the problem.
Any ideas?

I'm having the same problem. LaCie has been no help saying that they will give me a discount if I want to buy a new one.
The drive just doesn't appear in the Finder and the drive doesn't spin up like usual.

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