Ram not showing up after resetting nvram

I have a 3rd party battery that was not working properly. The company told me to reset my nvram. Since doing that, one of my memory chips is not showing up. It says "slot empty" and there is no memory there.
I read another post on here that said after updating to 10.4.9, there 3rd party memory disappeared as well. I updated around the same time that I reset the nvram.
I also tried resetting the pram.
I have a 15" aluminum powerbook G4 with os 10.4.9
Thanks for the advice.

Welcome to the Apple discussions.
Sorry to hear your memory disappeared. There's no such thing as third party memory - Apple does not manufacture it's own memory, rather it uses memory from company's like Samsung and others.
If it's the lower slot, it could be coincidental, however, there have been issues with the lower slot failing, and Apple has an extended warranty repair program to address it in a narrow range of Powerbooks. Info at http://docs.info.apple.com/article.html?artnum=303173

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