TV out low contrast problem with Tiger

I just recently upgraded to Tiger and went straight from 10.3.9 to 10.4.5.
My mini-DVI to TV adapter has always worked perfectly before, but now the display on my TV is very dim, with extremely low contrast and brightness. The TV is recognised correctly and all the settings, color profiles etc. are correct.
I have verified that this is strictly a software issue as booting from 10.3.9 fixes the problem, and the output to TV is bright and beautiful once again.
I've searched, but found no mention of this particular problem anywhere. I would love to find a solution as the TV out from the PowerBook is basically broke, and dragging the external FW drive to the TV to boot from 10.3.9 is not a practical option.
PowerBook G4 12" 1 GHz Mac OS X (10.4.5) 768 RAM

Thought it wouldn't do any harm to run MacJanitor - but it didn't do any good, either.
This continues through restarts. It is definitely local to this one machine as another Mac does not show it.
EDIT If I go in via http://discussions.apple.com/category.jspa?categoryID=160 I get the same thing except the Recent Threads only show solved/question icons, no titles or anything else.
M

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