I am trying to upgrade memory on an older PB model, Manufacturer number 842929102 Platinum 2010 series, Intel Pentium proc. with MMX. I am running windows 98 on it. It has the PB680 mother board in it. I had 24mb ram in it and am trying to install 128mb ram. I have also updated the bios in it to the latest 1.00.12. My problem is the system is only recognizing half of the memory (64mb of 128mb). I am sure the new chips are good because I have switched the sets around and they work. I dont think it is the mother BD because it recognized memory in all 4 slots before I tried to upgrade.