"No Signal" on Samsung HDTV

I am trying to connect my Samsung LN52B750 HDTV to my Macbook Air. I have monoprice's mini-DVI to HDMI cable. "SAMSUNG" appears as a display choice on the Mac, with different resolutions and mirroring options, but nothing I have done has been able to get anything besides "No Signal". I've turned mirroring on and off, overscan on/off, etc, but nothing shows up on the display. I've tried renaming HDMI1 on the Samsung TV to DVI PC and PC with no luck either Any ideas?

I tried my TV with a Windows 7 PC, and picture came right up. I also tried my macbook and cable on Panasonic plasma, and some Samsung's: unknown model and even this year B550 worked immediately with no issue. I went to Fry's and tried my macbook and cable with the B650 and B750 models there, and got no signal on them either.

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