Cannot prevent display from dimming after period of inactivity

once again, another weird unexplainable problem that has been discussed on here but never quite solved. this has nothing to do with the ambient light sensor or the "pass your hand over the speaker grill" situation.
the problem is that my screen dims after about 2 minutes of inactivity. I've got the "reduce screen brightness before sleep" UNchecked, and the "adjust brightness as ambient light changes" is also UNchecked. I've made these settings for both the power adapter and the battery. I don't see any reason why the screen should dim unless I've checked the option to make it do so.
any ideas?

I found this:
http://www.technodaddy.com/wp/2005/07/24/mac-tip-how-to-stop-tiger-from-half-dim ming-your-screen/
which I tried, and it worked. however, when I listed the current state (according to the directions) it was already at 0 (zero) but I did the command as directed and it doesn't dim any more.
cheers!
15" powerbook (new version) Mac OS X (10.4.3) 100 GB 7200 rpm hd

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