Skip navigation

USB power problems, all of a sudden

348 Views 3 Replies Latest reply: Jan 20, 2013 2:43 AM by tony8028 RSS
tony8028 Calculating status...
Currently Being Moderated
Jan 19, 2013 7:09 PM

i have a newish MBP that has all of a sudden devloped a USB port issue.



As a musician, i use my MBP to run a live keyboard rig which consists of an AKAI MKB61 and a Native Instruments Kontrol 1 audio box - both of these are USB powered.



This set has has been running well for 4 months, no issues.



Recently my hard drive died (literally there one minute, unrecognisable the next) which Apple replaced.



Since then, I get a message from the USB that one of the devices is drawing too much power, so one of my ports has been disabled. So I am essentially down to one USB port.



I am thinking that this shouldnt have anything to do with the hard drive issue, but its the only thing that has changed on the machine.



Any thoughts welcome.

Macbook Pro, Mac OS X (10.5.8)
  • Mike Sombrio Level 6 Level 6 (9,065 points)
    Currently Being Moderated
    Jan 19, 2013 8:14 PM (in response to tony8028)

    Try resetting the SMC. Depending on which Mac you have the instructions are different so choose the right procedure.


    MacBook and MacBook Pro 

    Laptops with a battery you can remove 

    Shut down the computer.

    Disconnect the MagSafe power adapter from the computer, if it's connected.

    Remove the battery.

    Press and hold the power button for 5 seconds.

    Release the power button.

    Reconnect the battery and MagSafe power adapter.

    Press the power button to turn on the computer.


    Newer Mac portables with a battery you can't remove.

    Shut down the computer.

    Plug in the MagSafe power adapter to a power source, connecting it to the Mac if its not already connected.

    On the built-in keyboard, press the (left side) Shift-Control-Option keys and the power button at the same time.

    Release all the keys and the power button at the same time.

    Press the power button to turn on the computer.  

    Note: The LED on the MagSafe power adapter may change states or temporarily turn off when you reset the SMC.

  • Alan Bishop2 Level 2 Level 2 (380 points)
    Currently Being Moderated
    Jan 20, 2013 12:32 AM (in response to tony8028)

    Hi Tony,


    If what is suggested above does not work get a mains powered USB hub.


    Good luck,




More Like This

  • Retrieving data ...

Bookmarked By (0)


  • This solved my question - 10 points
  • This helped me - 5 points
This site contains user submitted content, comments and opinions and is for informational purposes only. Apple disclaims any and all liability for the acts, omissions and conduct of any third parties in connection with or related to your use of the site. All postings and use of the content on this site are subject to the Apple Support Communities Terms of Use.