My building houses a few design, film and architecture companies. Some of these businesses are constantly upgrading their equipment and are getting rid or old stuff. A few days ago I found 2 Macs sitting by the trash bin: both are PowerMac G4 with the model number M8493 Are these Macs still useable? If yes, can I use them for today's web browsers, photo editing and general computing? I have not yet switched them on, so i don't know if they are functional. Thanks in advance for any replies I will receive here.