Hello all, I just installed a new HD (I don't know if it has anything to do with this problem, though) and I thought that my computer was running a little slower than usual. I have a 15" PowerBook G4 (Alum.) 1.67GHz and 1GB (512 x 2) of RAM. I checked the "About this Mac" and it claims I only have 512 MB. There are two 512 sticks in my PowerBook (I checked!), so for some reason the second stick isn't being recognized. What do you think is wrong? Should I just disconnect the sticks and put them back in? Please help.