Only one USB port - Error Message: USB Device Not Recognized

Posted on 2007-10-15
Last Modified: 2013-11-17
This laptop is a Dell Inspiron 6400 with 4 USB ports in all.
Recently, most notably, after I upgraded the drivers listed in the Dell site, one of my USB ports started giving this "device unrecognized errors". It comes for flash drives whereas the USB mouse doesn't even elicit that response too. It just doesn't give even a beep sound for device plugging.
But, the mouse gets powered on (from the laser light-optical mouse). I have tried uninstalling USB hubs and controllers from both normal and safe mode. restored BIOS settings to default.
Both the mouse and the flash drives work on rest 3 ports without any problem. Also, the faulty port was the most used, until now.
I want to explore all options before considering the BIG fresh install as I have a heavily customized OS (Win XP Sp2 with all latest updates).
Question by:rookie_in
    LVL 14

    Accepted Solution

    First, determine if its a hardware or software problem.  Download a bootable Knoppix iso and burn it to CD.  Then use it to boot your computer with the mouse plugged into the troublesome port.  If the mouse works correctly then you have a software problem and if the mouse doesn't work then you have a hardware problem.  If its a hardware problem then you are likely out of luck as these ports are not generally repairable.  If its a software problem we can probably solve it.  Let us know the results.
    LVL 31

    Expert Comment

    One possible, repairable HW problem is foreign matter in the physical port...  E.g. lint, hair, dust; something that prevents connection on the signal lines in the USB connector. A flashlight and a magnifying glass might be helpful.
    LVL 91

    Expert Comment

    you can also try a system restore to a previous date

    Author Comment

    wow! it never occured to me!! will try that out n let u know

    will look into tat too

    don't have restores to tat date..

    Author Comment

    Hey guys sorry for taking so long.

    I booted the system from Ubuntu live cd and the USB failed again.

    I called up Dell support and they asked me (after the usual stuff of trying to convince you everything is wrong on your part) to send in the laptop.

    thanx again.

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