Brightness setting changes everytime I turn on my powerbook.

Everytime I turn on my powerbook the brightness setting is at a different level. Sometimes it is all the to the dimmest setting and I can't even locate my pointer because my screen is so dark. Is there a way to keep the brightness setting from changes levels?

I have a brand new macbook that is having this problem, and I already have the display setting with the brightness slider all the way to the right, so that's not the problem. This machine is a replacement for an early macbook that went through too many repairs and finally got replaced. I never had this problem on the old one, so I'm baffled. I have installed all updates and I have my settings all the same as on the old machine, so I can't figure out why it's behaving this way. It doesn't happen every time the machine sleeps or restarts, but sometimes when I come back to the machine, I find the brightness is turned all the way down and I have to turn it back up.

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Long time listener, first time caller-
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Brightness setting changes everytime I turn on my powerbook.

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