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1 USB Port Not Working Properly

353 Views 4 Replies Latest reply: May 14, 2013 1:22 PM by paulfromwinchester RSS
paulfromwinchester Calculating status...
Currently Being Moderated
May 14, 2013 11:25 AM

My 2010 13" MBP has one of the USB ports not working fully.


It will not mount a USB disk drive or recognise a printer. It does power an iPhone and the iPhone is recognised in iTunes and Image Capture. It also fully detects a Garmin device. With the disk drives, you can hear that they receive power from the MBP, but they are never mounted.


I have tried SMC and PRAM reset but this does not change anything


The behaviour is the same regardless of whether mains power is applied or not


Any suggestions before taking to Apple Store?




  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    May 14, 2013 12:12 PM (in response to paulfromwinchester)

    Some port powered drives take too much power so they get cut off.


    Use a powered USB port hub.

  • ds store Level 7 Level 7 (30,305 points)
    Currently Being Moderated
    May 14, 2013 1:08 PM (in response to paulfromwinchester)

    It might be recently happening because Apple issued a software or firmware update to cause it to do that.


    It might be in the case of the printer which has it own power that there might be a worn out USB port or cable, or it could be that one device is drawing too much and thus can't transmit to the printer.


    It's hard to determine exactly what the cause is, you will have to do a extensive process of elimination to determine which device and port/cable is the problem.


    If it's a port on the Mac and it's under AppleCare/warranty they will fix it.


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