I have an 20 inch 1.83 imac w/ 2 gigs of memory. I also bought at the same time an Airport Extreme. I had 2 printers and a external hard drive hooked to the imac with cabling. I moved these items to the closet where the Airport is hooked to the internet. I can get either printer working alone , they are hooked via a powered usb hub. I moved the connections around but the extreme see only one printer. The Airport 's firmware is 5.7, and OSX is 10.5.6. What am I missing, or is the Airport to old to do the job(4.5 yrs) ?