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  1. #1


    Member Since
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    Question USB port drawing too much power HELP?!
    please forgive me if i have post this in the wrong place, literally just made this account.

    basically i keep getting these annoying messages on my mac about the USB drawing to much power.

    "USB port drawing too much power.
    The device that is plugged into it will be deactivated"


    all i have plugged in is a logitech mouse, and my charger (both of which are plugged in pretty much all day.)

    three main questions really,
    1) how to i stop the annoying messages which keep popping up?
    2) what is actually happening?
    3) and when the message appears, the mouse stops working for a few seconds then works again after a click - how do i keep it working?

    thanks alot, jack

  2. #2

    chscag's Avatar
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    The amount of power drawn by the Logitech mouse is very small and should not cause that message to appear. It's likely occurring from your charger that you have plugged in. What kind of charger is it that you have to have it plugged into a USB port all day?

    You can cause serious damage to your machine if you continue to overdraw the USB power it can supply. I suggest removing the charger and plug it in elsewhere or buy a powered USB hub and use that instead.

  3. #3


    Member Since
    Apr 08, 2010
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    15" Macbook Pro, Intel, 2.8 GHz, 4GB
    What kind of a Mac is it? iMac? MacBook? If it is a MacBook, is it dented anywhere around the USB ports?

  4. #4


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    Quote Originally Posted by chscag View Post
    The amount of power drawn by the Logitech mouse is very small and should not cause that message to appear. It's likely occurring from your charger that you have plugged in. What kind of charger is it that you have to have it plugged into a USB port all day?

    You can cause serious damage to your machine if you continue to overdraw the USB power it can supply. I suggest removing the charger and plug it in elsewhere or buy a powered USB hub and use that instead.
    Quote Originally Posted by metalheart View Post
    What kind of a Mac is it? iMac? MacBook? If it is a MacBook, is it dented anywhere around the USB ports?

    thanks for both getting back for me.
    i have the charger plugged in the majority of the day, but its the mouse causing the problems

    and this is the type of macbook i have
    Google Image Result for http://brain.pan.e-merchant.com/5/5/05306955/g_05306955.jpg

    and there is no dents.

  5. #5

    chscag's Avatar
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    Late 2013 27" iMac, iPad 3, iPhone 6s+, iPhone 6+, 3 iPods, El Capitan
    thanks for both getting back for me.
    i have the charger plugged in the majority of the day, but its the mouse causing the problems
    As a test, why don't you disconnect the charger for awhile and only use the mouse? Let's see what happens.

  6. #6


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    Quote Originally Posted by chscag View Post
    As a test, why don't you disconnect the charger for awhile and only use the mouse? Let's see what happens.
    i've just done this using the mouse plugged in and having the charger out
    the message still appears.

  7. #7

    chscag's Avatar
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    Well then, it appears your mouse is defective. I've never seen any kind of mouse overdraw power from a USB port. It's usually devices like chargers and iPods (especially an iPad) that cause that error to appear. The solution is to buy another mouse. Any USB mouse should work with your Mac.

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