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  1. #1


    Member Since
    Jun 15, 2011
    Posts
    1
    USB port disabled for drawing too much power
    Hi, Last night I put my computer to sleep and I woke up this morning to the error message saying

    "Because a USB device was drawing too much power from your computer, one or more of your USB devices have been disabled. To prevent damaging your computer, the USB device drawing too much power has been disabled. Other devices may have also been disabled. When you disconnect the device drawing too much power, your other USB devices will be enabled again."

    The device that isn't working is a Razer Naga mouse.
    It doesn't work on my iMAC nor on my Mac Book Pro.

    Doesn't show up on the system profiler either

  2. #2

    Slydude's Avatar
    Member Since
    Nov 15, 2009
    Location
    North Louisiana, USA
    Posts
    10,461
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    Maybe others will have different experiences but in my case that message was an indication the device was failing. Initially I was getting the error initially with the Mac Book Pro but with a bit of troubleshooting noticed it on a Mac Pro as well.
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  3. #3

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,106
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    The device that isn't working is a Razer Naga mouse.
    It doesn't work on my iMAC nor on my Mac Book Pro.

    Doesn't show up on the system profiler either
    Slydude is correct. The fact that your mouse refuses to work on both the iMac and MBP and doesn't show up in System Profiler, is a fairly good indication that it may be defective.

  4. #4


    Member Since
    Apr 13, 2008
    Posts
    29
    I am getting the same message with both my newly replaced Nano as well as my iPod Touch G4. Can they both be defective at the same time? The Nano is about a month old and is the replacement for one that was about 2 1/2 years old still under Apple Care. The iPod Touch was bought in March 2011.

    Before I started getting this message the Nano went black when I tried to turn it on. Then I plugged it into the wall socket thinking that the battery was dead. Nothing happened. So I plugged it into my computer and that's when I got the message.

    That was several days ago. Now when I plug my Touch into the computer I get the message sometimes immediately after plugging it in and sometimes it might take about 5 minutes during which time I am able to sync it. It's not consistent.

  5. #5

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,495
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S
    Using the same cable to attach both of them?

    Use a different cable. Had the same thing yesterday on the wife's MB connecting her iPhone. Same thing using her cable on two other Macs. Changed the cable and problem went away.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  6. #6


    Member Since
    Apr 13, 2008
    Posts
    29
    Problem Solved
    Quote Originally Posted by bobtomay View Post
    Using the same cable to attach both of them?

    Use a different cable. Had the same thing yesterday on the wife's MB connecting her iPhone. Same thing using her cable on two other Macs. Changed the cable and problem went away.
    I tried this and so far it has worked for me. Thanks, Bob. Saved me a lot of money.

    Thanks also to the forums. So far each time I have come here with problems they have been solved by information gotten here.

  7. #7

    bobtomay's Avatar
    Member Since
    Dec 22, 2006
    Location
    Texas, where else?
    Posts
    26,495
    Specs:
    15" MBP '06 2.33 C2D 4GB 10.7; 13" MBA '14 1.8 i7 8GB 10.11; 21" iMac '13 2.9 i5 8GB 10.11; 6S


    Glad to be of service.
    I cannot be held responsible for the things that come out of my mouth.
    In the Windows world, most everything folks don't understand is called a virus.

  8. #8


    Member Since
    Sep 19, 2011
    Posts
    1
    usb port disabled for drawing too much power
    I have this same problem with my macbook pro. The device is a SIIG fan/light that plugs into the usb port for power. I've had the fan for awhile with no problems. Today I get the message mentioned by other members. I restarted the mac but I get the same message and the port doesn't power the fan.

    Ideas?

  9. #9


    Member Since
    Oct 16, 2011
    Posts
    3
    Hi all,
    I just joined the forum to ask the same question. I have switched to Mac recently and started to get the same message above when connecting an external HDD. I have MacBook Pro early 2011 model.
    Each time I plug in my external HDD I get the above message. The ports seems to be working if I connect other USB devices like USB Flash or external keyboard.

    I tried disconnecting the battery for several hours but didn't help.
    Do you thing guys that it is my HDD or cable that is causing the issue?

    Thanks for any help...
    Daniel,

  10. #10

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,106
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    You can always swap the cable to check it, however, it sounds more like your hard drive is drawing too much power. What kind and size is it? Also, do not keep plugging it in to your MBP as that could damage the port if indeed something is wrong with the drive.

  11. #11


    Member Since
    Oct 16, 2011
    Posts
    3
    Thanks for your reply chscag.

    Actually the external HDD is the Mac's old HDD which I replaced with SSD drive for performance ( I put the old HDD in a case and use it as external HDD.)

    Thanks,

    Daniel

  12. #12

    chscag's Avatar
    Member Since
    Jan 23, 2008
    Location
    Fort Worth, Texas
    Posts
    49,106
    Specs:
    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    OK, thanks for posting back. The carrier case may be at fault. I've run into USB carrier cases that didn't work right. All I can suggest for now is not to use the drive until you can determine what is causing the excessive power draw.

    You might want to try another carrier case or perhaps an adaptor. I keep a universal adapter handy for testing plus several different types of carrier cases.

  13. #13


    Member Since
    Oct 16, 2011
    Posts
    3
    Good advice! I'll try and post back.
    Thanks heaps!

    Daniel,

  14. #14

    Slydude's Avatar
    Member Since
    Nov 15, 2009
    Location
    North Louisiana, USA
    Posts
    10,461
    Specs:
    2.8 GHz MacBook Pro 10.11, 8 GB mem, iPhone 6+
    Do you get the same message if you connect the drive to a powered USB hub?
    Sylvester Roque Former Contributing Editor About This Particular Macintosh

    "Got Time to breathe. You got time for music." Denver Pyle as Briscoe Darling

  15. #15


    Member Since
    Jul 07, 2008
    Posts
    3
    hi i get the same message when i connect my external hdd to my mac mini. the external hdd is powered so don't know why its saying drawing to much power. I now have three of the four ports unusable now? how can i get the usb ports working again? will a complete reinstall of os help restore function to them?

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