How to reset a USB port if power limits have been exceeded

Written by kenrick callwood Google
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How to reset a USB port if power limits have been exceeded
Windows may issue a power warning for a USB port that makes it necessary to perform a reset. (USB image by Angelika Bentin from

USB ports have a power limit established to keep the ports from overheating or potentially damaging the devices connected to them. If a device is deemed by Windows to be causing a draw on a particular port, a warning message will appear to notify the user of a problem. Sometimes these "problems" are just software conflicts that may occur when the computer comes out of suspended or hibernation mode. Other times, however, there may be a legitimate power drain. In either case, resetting the USB port tends to fix the problem.

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  1. 1

    Download Microsoft Devcon to the desktop (see Resources).

  2. 2

    Double-click on the installation file and install the program to the "C:\Windows" folder.

  3. 3

    Press the "Windows key + R" on the keyboard.

  4. 4

    Type "devmgmt.msc" without the quotes and press "ENTER" to open the device manager.

  5. 5

    Press the "+" symbol next to the "Universal Serial Bus (USB) Controllers" heading to expand the group.

  6. 6

    Double-click on each of the "USB Root Hub" listings and click the "Power" tab until you find the listing with the device listed in the "Attached Devices" area. This is the port that is generating the warning message.

  7. 7

    Select the "Details" tab of the problematic port and select "Device Instance Id" or "Device Instance Path" from the drop-down menu.

  8. 8

    Take note of the information between the two "/" marks. For example, "ROOT_HUB49."

  9. 9

    Press "Windows key + R" and type "cmd" without the quotes and press "ENTER" to open the command prompt.

  10. 10

    Replace "ROOT_HUB49" with the information noted earlier in the following code to disable the port: devcon remove ROOT_HUB20

  11. 11

    Type "devcon rescan" without the quotation marks to reset the USB port.

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