Well maybe not, but that's when it seemed to happen. After installing 10.4.4 (and all the other updates) yesterday, I clicked on "About my Mac" from the apple menu and noticed that my RAM had been cut in half: 512 down from 1Gig. Openning the system profiler I found that my 15 Powerbook (FW800) believes that the "lower" Ram slot is empty and the "upper" one has 1 512 stick of Ram. I opened it up and confirmed that both sticks of Ram were still there, so I swapped them but continue to get the same message: Only 512 of Ram and the "lower" slot is empty. I'll be taking it in for repair, but I wanted to know if anyone else experienced dissapearing Ram following updates. Anyone?