Dear forummers, Today I'm buying a secondhand PB G4 15" 1,5 GHz. Is there anything I need to pay attention to, before I give the guy my cash? I know about the lid mechanism, I'll be sure to check that. Also, how many RAM slots are filled on a standard PB? The guy says it's equipped with 512 MB, I believe that's standard. To upgrade to 1GB (which I want), do I need to buy an extra 512 megs, or is the standard 512 MB devided onto 2 x 256 megs? Anything else I need to look out for?