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Anthony Acock Level 1 (105 points)

Hello,

 

I keep getting this error.

 

" 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."

 

I'm using a macbook pro, which is about a year old. the only thing i have plugged into a usb port is a keyboard. the mouse i am using is a mighy mouse. both keyboard and mouse work fine. just keep getting this obnoxious popup.

 

any idea how to resolve this?


MacBook Pro, Mac OS X (10.7.2)
  • Shootist007 Level 6 (16,660 points)

    And what do you have plugged into the USB port? A coffee warmer?

     

    No I'm not kidding. Some one else posted about that same error message and it turned out he had a coffee warmer connected to the Mac USB port.

     

    If you are that poster or you have a coffee warmer connected thenn disconnect it and drink your coffe faster and or use a thermos mug.

  • Anthony Acock Level 1 (105 points)

    No....

     

    Like I said in my post, " the only thing i have plugged into a usb port is a keyboard."

  • OGELTHORPE Level 8 (45,207 points)

    Take a screen shot of this message and take all the items to an Apple Store Genius bar.  They should be able to diagnose the problem.

     

    Have you attached other peripherals and if so has the same message appeared?

     

    Ciao.

  • Anthony Acock Level 1 (105 points)

    Thank you for  a real answer!

     

    I will next one that pops up. I have an external monitor attached to my laptop. But it seems to running fine.

  • Anthony Acock Level 1 (105 points)

    I got a screenshot for you. Does this clarify it at all?

    What I have plugged in is: my iPhone, and my keyboard.

     

    Hope this helps.

    Screen Shot 2012-02-16 at 11.09.20 AM.png

  • ds store Level 7 (30,325 points)

    Anthony Acock wrote:

     

    I have an external monitor attached to my laptop.

     

    Well there it is there, power draw is a power draw.

     

    What you can do is buy a powered USB hub and that will remedy your problem.

     

    also do a SMC reset

     

    https://support.apple.com/kb/HT3964

  • Anthony Acock Level 1 (105 points)

    Thank you ds store. I will try that. After looking at the link you posted, my computer shows other symptoms as well. (loud fan, etc).

  • ds store Level 7 (30,325 points)

    Ah!  Good. hope it fixes it.

  • sanjampet Level 5 (7,760 points)

    try a different keyboard, there could be an issue with the cable or connector

  • Kevin Maness Level 1 (0 points)

    I'm having that problem, too, but with a 2010 MacBook. I've been getting that error message periodically—including when I first power up my computer. The thing is, I have only two USB devices plugged into my laptop, and both are powered USB hubs. The only thing plugged into one of those hubs is my iPhone charge cable, and my iPhone's not attached. The other hub is attached to my Apple keyboard and a printer (the printer, of course, has its own power).

     

    Another thing is, the Apple keyboard works, even after I get that message, so apparently it's not the thing that's being disconnected to save power, yet it's the only thing that doesn't provide its own power.

     

    Any advice? Otherwise, I foresee a visit to the Apple Store in my future.

  • Timothy Elliott1 Level 1 (125 points)

    I just had my MacBook Pro give me the "USB device drawing too much power" warning, too. The problem is that it disabled my connection to an external hard drive while the drive was spinning. Gee, thanks, Apple - next time how about a chance to eject the drive correctly and protect my data?

     

    When did this benevolent USB power grab start? I've never seen this warning before, and I haven't added any USB devices to the lineup for at least six months.

  • Kevin Maness Level 1 (0 points)

    Yeah, it's weird. I can't think of anything that would be drawing power. And I reliably get the message first thing when I start up my computer. It doesn't seem to make sense.

  • Courcoul Level 6 (12,996 points)

    The USB2 spec states that the max. current available on the plug is 500 mA. That's why some devices from the PC world sport a strange two-headed USB cable, so they can suck the whole Amp from the computer.

     

    But in this case, if the power management is deciding there's too much power drain from the get-go with nothing plugged in, there definitely is something wrong. Mind you, some of the components on the Mac are internally connected to the USB infrastructure, such as the trackpad, camera, etc. I'd suggest the following:

     

    1. Reset the SMC:  http://support.apple.com/kb/HT3964
    2. Run the extended Apple Hardware Test: http://support.apple.com/kb/HT1509
    3. If all else fails, schedule a visit to the Apple Store. Hope the Mac is still under warranty.
  • Csound1 Level 8 (46,992 points)

    Anthony Acock wrote:

     

    Thank you for  a real answer!

     

    I will next one that pops up. I have an external monitor attached to my laptop. But it seems to running fine.

    You have an external monitor connected to a USB port?

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