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Yikes... try hooking up the computer to an external monitor to begin with (not a TV) -- this will determine whether the PowerBook and adapter are working correctly.
If you can get it working correctly first with an external monitor, then we can move on to getting it working with the TV. TVs and monitors are quite different in their specs, resolutions, refresh rates, etc. Some TVs just won't work, while others will work flawlessly.
The fact that the internal monitor goes to blue, then black, then the desktop appears again indicates that the adapter and Mac OS X are working correctly, but the TV may not have a resolution/refresh rate supported by the hardware.
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