Leopard "kind of" detects my LCD TV, but doesn't work ( DVI-to-HDMI )

I recently bought a new LG 32" (32LG5000) and was hoping to hook it up to my laptop. When I connect the DVI-to-HDMI cable (DVI on macbook, HDMI on TV port), Leopard's screen turns "blue" for a sec, like if it was detecting/adjusting/whatever the external LCD, but simply returns to normal after that. External LCD continues with "No signal" message on-screen, Leopard doesn't show any new monitors, and I can't figure out the problem.
My TV has 3 HDMI ports, altough one of them is to be used on DVI-HDMI connections, and I've tried to connect to all three of them with no success.
Maybe the cable is faulty ?
My system is:
Macbook Pro 2.4Ghz C2D , 4GB RAM, Geforce 8600M GT

yes, 256 should be sufficient.
Many TVs do not 'autosense' which input is receiving a signal - you have to manually cycle through the available ports.
Verify the TV is set to the correct HDMI port.
(my tv has 2 different HDMI-in ports)
Your resolution is set to 1680x1050.
Check the TV manual to see if it supports that resolution.
It is also possible your DVI->HDMI adapter does not support a particular resolution. It should, but should and do are not always the same.
Does your TV have a standard DVI connector, and have you tried it?
Another thought - is the 8600 HDCP compliant? If not, then it's also possible the lack of HDCP on the card is preventing the image from going through the HDMI port on the TV, rather, the HDMI port on the TV is ignoring the input because it's not getting a valid response when it performs the security check.
I believe using the DVI port bypasses the HDCP compliance check.

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