Adjusting the brightness of G4 400 TiPB doesnt work

Hi folks,
my Boss´G4 400 Titanium Powerbook recently showed a problem with the F1/F2 Keys. Pressing F1/F2 has no effect - the brightness of the display cant be changed anymore although the other controls, i.e. Volume via F3/F4/F5 work normally. Also the screensigns which appear in the middle of the screen when you change the brightness dont appear anymore, which is unlike other related problems posted here before. The screen itself looks like the brightness is adjusted to a rather dim setting or around a middle setting (kinda hard to tell when you cant change it). Searching other related topics, I found hints that this may be a TiPB related (and known?) issue but I couldnt nail it to the exact issue. After updating to Tiger and then to 10.4.2 the problem didnt show up at first (he updated just after Tiger´s release), everything worked fine until yesterday. Anyone got a clue to what caused this and maybe how to fix it?
Thank you in Advance
Dennis

I am experiencing the same problem on my TiPB 400: very dim display, brightness controls on keyboard don't work and don't generate the screen icons, no brightness adjustment slider in the display system preferences panel, as it should be (and was). I went through the usual resets (hardware reset button, PRAM, open firmware).
I occurred just about two days ago, right about after the most recent security and Quicktime update.
I am running 10.4.6 and have been since it became available, without seeing this problem.
Given the fact that there are distinct features missing from the software (icons and control slider), I am not so certain whether this is just a bad inverter. Or is OS X this smart?
Another problem, which may or may not be related:
Just a bit sooner, my airport connection started to fail. I have several computers connected to the same network (typing right now from a !2"PB), so I know it's not the network. I also have an external AriaExtreme wireless card that is also unable to connect, so it is again somewhat less likely to be a hardware failure. This card is recognized by software, but the airport software doesn't seem to be able to control it anymore as it used to do just last week.
Any suggestions?

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