Tibook 800 screen goes dim

PowerPC Macs

Iv got a problem with my tibook 15 inch 800mhz, when i start up it is ok for a couple of seconds then the screen goes very very dim I can just about make out my desktop. If i put it to sleep by closing the lid then awakening it by opening it again the same happens.
I was wondering if any one know what is wrong with it?

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Known issue with Tiger that h

Known issue with Tiger that has been going on for months for me. Your lucky if it is just starting. Before my AppleCare ran out in December I was on the phone a few times with AppleCare, but they have yet to fully fix the problem.