I want to hook up my Canon Selphy and an external hard drive. What's the best way this can be done? My PowerMac G5 is currently hooked up to an ethernet cable. I notice there's an other one in the back... Could I just wire another cable and stick it in the back of the Airport Extreme Base? Is there anyway I could add it to the existing wireless, or would I have to create a new one because the G5 doesn't have a airport card inside? I'd want it to work between my MBP, iBook, and all the other laptops in my house.