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    Weird USB problem

    Discussion in 'HP' started by Balrog, Mar 23, 2007.

  1. Balrog

    Balrog Notebook Consultant

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    All of a sudden my nc8430 started exhibiting extremely odd behavior: I started getting the 'ding-dong' / 'dong-ding' chimes of a USB device repeatedly being connected and disconnected, and Windows (XP Pro SP2) started popping up notifications that a USB device had malfunctioned. The only USB device I had connected was my Logitech mouse, but that was still working fine, and removing it didn't stop the problem either.

    I had no idea what was going on; checking the device manager showed a "Unknown Device" repeatedly appearing and disappearing in the "Universal Serial Bus Controllers" tab. Not having any better ideas, I tried disabling each of the five root hubs one at a time, and sure enough, disabling the fourth one (out of five) stopped the problem. Some testing with my mouse dongle showed that that's the one that controls the single USB port on the left side of the notebook. I don't know what the other thing is that's causing all the trouble (each hub controls two ports); but it's not the SD card reader - I tested that out and it's still fine. The other thing adjacent to the affected port is the Firewire port, but that shouldn't be causing USB problems anyway.

    Any ideas as to what it might be?

    [​IMG]
     
    Balrog, Mar 23, 2007
    #1