PPC Mac upgrade from 10.4.11 to 10.5.6 disabled memory

I have a G4 PowerBook and I just upgraded to 10.5.6. For some reason the system only sees one of my two 512 mb memory chips it says the other slot is empty. This memory was factory installed when I bought the computer. It was fine before I upgraded. Any Ideas?

Note, Best I can tell the later PowerBook G4's have problems with the Lower Memory slot. My Daughter has been using a 15" / 1.67 G4 that we purchased in July 2005 and bought Apple Care at that time. Starting in May of 2008 it stopped seeing the Lower Memory slot, Apple replaced the mother board and that repair was covered by 90 day repair warranty. It stopped seeing the lower slot in October 2008, and Apple replaced the mother board again and it worked until the end of December when the 3rd mother board would no longer read the lower slot. My daughter also has a friend with a same vintage 1.5 GHz 15" PowerBook G4, and her's is not reading the lower slot either.
The good news in our case is that after the 3rd failure Apple replaced her G4 with a new MacBook Pro. Other than this issue we had gotten good service out of that G4, and now have a brand new MacBook Pro.
There was a Service Extension Program for specific S/N G4s with this problem, but I think it is much wider spread than the S/N in that program.
We were very lucky to catch the problem while still under warranty, and to have each subsequent failure occur within the repair warranty period.
Note that my daughter's G4 was running Leopard when this started happening, but her friend is still running Tiger. I don't think the OS version has anything to do with this problem.
Message was edited by: gbullman

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<hr>
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Welcome To Discussions Aaron!
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