I have a 1.5GHz G4 Mac mini here that is struggling with the most basic day-to-day tasks. It takes ages to boot and has problems opening larger files. Since this computer hasn't really seen major usage (teh intertubes and word processing), I think it might be due to a failed harddrive. Naturally, my first idea was to boot it off an external USB harddrive, which I just found out is not possible with PPC Macs. Now I have two options: I either replace the internal harddrive or get an external FireWire one. Can anyone comment on either option? Also, since I don't really need major harddrive space on this Mac, what would be the cheapest harddrive you can think of? Thanks for helping.