Lost recognition of 512MB after 10.4.7 upgrade

Immediately after installing the 10.4.7 upgrade, my Powerbook no longer recognizes one of my 512 MB of RAM. System Profiler show one however it shows that the second slot is EMPTY!?! Is anyone else having this problem?? How can I fix it so I can get all 1.25GB of memory recognized again?!?!
Thanks for any help anyone can offer.
1.5 GHz PowerPC G4 Powerbook Mac OS X (10.4.7) 1.25 GB RAM

Thanks A Brody,
However, my machine is older than that program covers. I have a serial number outside of the covered range. It does sound like a similar problem though.
Thanks for the sugestion.
1.5 GHz PowerPC G4 Powerbook Mac OS X (10.4.7) 1.25 GB RAM

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http://nokia-n79-software.mobisystems.com/platform.html?c=1&sc=13
http://www.softwaremarket.nokia.com/?action=productDetails&pID=3504&pmsid=305〈=fi
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