I am often asked to do family chores related to the various devices everyone owns. This one has me in a bit of a pickle. I am dealing with a G5 Aluminum iMac, 27", mid 2011. This is a new device as the previous one was still having issues with the display and was recently replaced by AppleCare. The family member purchased a Toshiba Canvio Basics 3.0, knowing the compatibility said a reformat would be necessary (this is where I was called). It was not recognized by the iMac at all. Toshiba was of no help; they directed me to a guide on (of all places) macrumors on how to format it. I ended up connecting it to a dell laptop *shudders* to convert it to FAT32 so it would at least be recognized. Still nothing. Perplexed, I tested it on a G4 in the house as well as a '09 MBP (mine). Both read the device fine. while on the MBP I formatted it to Journaled, came back to the iMac and still nothing. none of the 4 USB ports worked for this particular HD. They have another Toshiba HD that reads fine every time in any USB port. switched cables, still nothing. Finally plugged it into the keyboard USB port on a whim, it connected and I started the transfer of information that we are trying to accomplish. Still curious why it's not working in any other ports on the back of the computer. Anyone have any ideas of other steps I could complete before calling AppleCare back tomorrow? T2 here I come tl;dr? G5 iMac mid 2011, 27" -10.7.2; software update shows nothing doesn't recognize Toshiba Canvio Basics 3.0 (status light doesn't even stay on) -Now formatted in Journaled, doesn't recognize -tested different USB cord; no change -tested different Toshiba HD; works Tried on '09 MBP and G4 iMac -both recognized in FAT32 and then in Journaled **somehow recognized on G5 when plugged into keyboard USB port** What's wrong with my USB ports? :/ thanks for any advice guys!