>Yes, the PB2400 worked fine with 16MB and booted up and ran just fine >with the 64MB card installed in the previously empty expansion slot but, >after booting, still showed only 16MB total memory. I am running MacOS >8.0 and the first order of business after installing more memory was to >install a newer OS - something I cannot do with the original 16 MB. (OS >8.6 requires 24 MB for installation). > >-tom Did you try zapping the PRAM after the memory installation? It's worth a shot. Might also check the Memory control panel. Mark