Currently I have OSX 10.3.9 and Facebook will not work. I have someone willing to upgrade me to 10.5, will FB work with this? What would happen if I upgrade but only have 512 MB SDRAM? I have read that I should have 1GB? ?? Also, what would my PowerBook G4 15inch 1.5 GHz be worth??- runs good but needs a new battery, missing a key, and titanium case dented/bent a bit.