IBook G4 Wigging out

If this has already been addressed, I apologize. I just wasn't entirely sure how to phrase this to see if anyone else was having this problem. For the past several months, my iBook G4 (2005) has been freaking out at random intervals. What do I mean by that?
I'll be working on it, then out of nowhere brightness will go all the way down, any applications that may be up and running will have items deleted out of it, volume goes all the way up and it types "1qa1qa1qa1qa1qa1qa" over and over again.
I've had it looked at two different times. My logic board is fine. So is the HD. In fact, our certified apple tech in town couldn't find anything wrong internally.
The HD had a 35-pass secure erasure done on it with OS 10.4.3 completely re-installed on it, no old information transferred over. Still freaks out.
Is this a keyboard issue? Any idea how I can fix this? It's kind of bothering me that I'm losing data.

MV,
I'll be working on it, then out of nowhere brightness will go all the way down, any applications that may be up and running will have items deleted out of it, volume goes all the way up and it types "1qa1qa1qa1qa1qa1qa" over and over again
This is a keyboard fault. If you notice the dim, 1, q a are on the same general line. If you could see the activation traces under the keyboard they form a matrix with those things on the same vertical. What generally happens is that something is spilled on the keyboard and these keys get activated via a short.
See which relates to the exact problem you're having. This was in response to someone who had this exact fault only without the dimming:
http://s291.photobucket.com/albums/ll306/spudnuty/?action=view&current=iBookKeyb oardmembrane1QA.jpg&newest=1
This was the effect of a spill on the keyboard. Beer I think:
http://s291.photobucket.com/albums/ll306/spudnuty/?action=view&current=iBookkeyb oardtracecorrosion.jpg&newest=1
So new keyboard.
Richard

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