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USB2 Device showing as 'Unknown Device'

Discussion in 'Hardware' started by DazBarber, Mar 31, 2004.

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  1. DazBarber

    DazBarber Thread Starter

    Joined:
    Sep 3, 2003
    Messages:
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    Hi,
    I've been scouring the newsgroups for answers to the following problem and have tried everything suggested to no avail...

    My USB 2.0 Pen Drive was working fine until yesterday. It now shows as unknown device and windows reports that it may not function correctly. It doesn't work at all!

    However, I took it to work with me and (on a USB 1.1 PC) it worked well.

    When I returned home, I tried again in my PC to no avail. I then tried uninstalling Root Hubs and Controllers and the like from Device Manager as suggested in many newsgroups and the thing sprang back into life. However, as soon as the
    Enhanced USB driver is detected, the pen drive vanishes and the 'unknown device' returns.

    I've been into safe mode, I've tried to delete the 'VID keys' from the USB section of the registry (which won't delete even though I log in as the administrator) and I've removed all USB devices and then uninstalled all hubs from Devce Manager and let them reinstall themselves.

    I now have my Pen Drive working in (I assume) 1.1 mode by means of 'disabling' the 'enhanced host controller'. As soon as it is re-enabled I lose my Pen Drive and return to 'Unknown Device'.

    XP says that my 'Enhanced Controller' has no problems.

    Please help - everything was fine on Monday and a restore does no good at all. Why can I not delete the VID keys?

    Thanks in advance,

    Daz
     
  2. LONGHAIR

    LONGHAIR

    Joined:
    Jun 11, 2002
    Messages:
    1,525
    It sounds like a driver issue to me.

    Are your USB2 ports "on-board" on from a PCI card?
     
  3. DazBarber

    DazBarber Thread Starter

    Joined:
    Sep 3, 2003
    Messages:
    7
    I'm guessing PCI based as the Device manager is showing 'Sis PCI to USB Enhanced Host Controller'.

    Thanks,

    Daz
     
  4. dai

    dai

    Joined:
    Mar 6, 2003
    Messages:
    11,198
    it sounds like the wrong driver to me also check the sis site they are pretty good at releasing updated drivers
     
  5. DazBarber

    DazBarber Thread Starter

    Joined:
    Sep 3, 2003
    Messages:
    7
    It was working fine. Would it just stop like that?

    Daz
     
  6. dai

    dai

    Joined:
    Mar 6, 2003
    Messages:
    11,198
    try reseating the card,the only thing i can think of is the driver got corrupted
     
  7. DazBarber

    DazBarber Thread Starter

    Joined:
    Sep 3, 2003
    Messages:
    7
    Having read my PC manual, it would seem that they are onboard USB ports, not PCI card ports.

    Daz
     
  8. dai

    dai

    Joined:
    Mar 6, 2003
    Messages:
    11,198
    try reinstalling the drivers from the m/b setup disk
     
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