As always, try reseating/reinstalling the RAM. If possible, try getting your hands on a known good 64MB chip and trying it in your machine (I know, probably not possible). I doubt there's a problem with your machine though, chances are it's a mislabeled chip or defective chip. If it's anything close to a legitimate company, they'll refund your money or swap the chip! Morris On 10/9/05, Brad Lincoln <bradlinc at mac.com> wrote: > Today I attempted to upgrade my 2400c to what I thought would be 80 > megs of ram . I had ordered 64 megs of ram from Memory X this summer > and had just now gotten around to installing it. The install went > well, however, upon restart the PowerBook only registered 48 megs of > ram. As the ram was labeled 64 megs is it safe to assume I was ripped > off or is there another logical explanation for this (ie some > software or hardware limitation)? > > - Brad Lincoln