MBP won't connect to external Toshiba LCD, MiniDisplay to DVI to HDMI

Brand new Mac Book Pro, 10.6.4, won't connect to external Toshiba 40" LCD display. I'm using a MiniDisplay to DVI-D adapter coming out of the computer. Then a 10' DVI-D (single link) to HDMI cable running to the display. When I connect the external display the MBP "searches" for a few seconds, but doesn't connect, and the Toshiba display reads: No video signal. This is with the MBP open and display on. BUT, sometimes when the MBP lid is closed, and I connect the display IT WORKS for a about 20 seconds, then the computer "goes to sleep" by itself, and the display shuts off. Strange problem... Also I've tested the computer with a 24" external Planar display (MiniDisplay to DVI-D), and it worked fine. Also the TV and DVI to HDMI setup works fine with my older MBP that has a DVI output. Any ideas...?

The adapter works perfect with other computers (mac pro and dual 24" displays). The problem only seems to happen with this new MBP, Toshiba TV, and the adapter configuration I described. I'm trying to find a friend with a similar new MBP, and try it with theirs. With so many components, it's hard to isolate the problem (especially when all the pieces seem to work properly on their own).

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