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USB Ports Suddenly Stop Working

Discussion in 'Hardware' started by ras951, Jan 19, 2008.

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  1. ras951

    ras951 Thread Starter

    Joined:
    Jun 11, 2004
    Messages:
    21
    Recently, I tried to connect something to a USB port, but they suddenly stopped working. I thought it was just the front 2 that were the problem, but then I tried to use my printer and since it's plugged in the back I thought the 2 USB ports in the back would work, but there was not connection to the printer. Now all 4 USB ports don't work. The wierd part is that when I try to plug in a USB jump drive, a light does blink on the jump drive for a split second so it seems like there's still power. I've uninstalled the USB stuff in device manager and rebooted, the computer does recognize the ports and said they were working properly, but the devices I plug in still don't work. Is there anything else that can be done about this problem? I know my jump drive and printer still work.
     
  2. bigbear

    bigbear

    Joined:
    Apr 27, 2004
    Messages:
    4,719
    Try this registry fix by JohnWill

    Create a file with NOTEPAD containing the following lines and save it as FIX.REG
    -------------------------- Use text after this line --------------------------------
    REGEDIT4

    [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\Session Manager\Environment]

    "DEVMGR_SHOW_NONPRESENT_DEVICES"="1"
    -------------------------- Use text before this line --------------------------------

    Double click on FIX.REG and say yes to the Merge Into Registry question.

    Unplug ALL USB devices.
    Open Device Manager.
    View, Show Hidden Devices.
    Uninstall all devices under USB Controllers.
    Uninstall all devices under Disk Drives that you know are not present.
    Uninstall all devices under Storage Volumes. Say no to any reboot prompts until you are finished. Also, if a Storage Volume doesn't uninstall, ignore it and move to the next one.
    If you have a yellow ? with unknown devices, uninstall all of the entries there as well.

    When this is done, reboot TWICE.

    Reconnect the USB devices and see if they're recognized properly.

    NOTE: If you have a USB keyboard and/or mouse, you'll have to modify the instructions and leave enough parts for those to function. I don't have one yet, so I haven't had time to modify the instructions.
     
  3. ras951

    ras951 Thread Starter

    Joined:
    Jun 11, 2004
    Messages:
    21
    Are the front and back USB ports on a tower connected with the same type of cord? If so, I might of fried something, but it's kind of wierd that a light blinks on my jump drive for a split second and device manager still recognizes the ports.
     
  4. ras951

    ras951 Thread Starter

    Joined:
    Jun 11, 2004
    Messages:
    21
     
  5. JMS340

    JMS340

    Joined:
    Jan 28, 2008
    Messages:
    1
    Hi GUys
    I have a very similar USB problem with my sons computer.
    I tried using the fix registry instruction but I received an error message that the registry could not be accessed - any thought?
    Appreciate the help
    John
     
  6. rdjanssen

    rdjanssen

    Joined:
    Mar 8, 2008
    Messages:
    1
    I've got a similar situation in which none of my six (two front, four back) USB hubs are working. The device manager detects them and says they are running fine, but nothing connected to them works.

    When connecting or disconnecting my MP3 player, the player briefly lights up, but the computer never detects it.

    I tried the solution listed here to no avail.

    Any other thoughts or suggestions?
     
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