Lower RAM defect after upgrading to 10.4.4

I have an early model Aluminum Powerbook G4 (1Ghz) and now have the lower
ram slot problem. I do feel the problem potentially exists in all the Aluminum 15" models. It's quite amazing how many things have happens since getting this powerbook. First battery problems (recall), then screen problems (extended warranty offered-took awhile thought) and now this. Does anyone
know if the replacement logic boards being offered are any less prone to
give out? It would be a drag to pay and have it breakdown again (of course after
any warranty period).

I'm beginning to think this is a software problem related to Tiger. It seem to me, nearly everyone with this issue experienced this "lower slot" problem when upgrading to 10.4x.
I am still on Panther 10.3.9, and I recently upgraded my lower slot memory, taking out the stock 256MB module, and putting in a 512MB one. It's early days, but it's working fine, and system profiler is recognizing the new 512MB RAM in the lower slot.
You actually had the lower slot stop working, AFTER you upgraded to 10.4.4.? Sounds like I could be onto something! Are you listening Apple!!
The problem seems to be worse in the newer machines (1.67 and the newer hi res models), but now it seems, that anyone with an Aluminium 15" Powerbook can get the problem.
I heard of one guy having 4 different logic boards in his Powerbook, so it doesn't seem to me to be the solution to the problem! Until Apple actually find the proper cause, and fix it, I certainly won't be upgrading to 10.4, just to be on the safe side.
15", G4, 1.25Ghz Alum Powerbook Mac OS X (10.3.9) 768MB RAM

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