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USB ports not working (Solved, but...)

Discussion in 'Windows 7' started by NicklasPS, Dec 9, 2011.

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  1. NicklasPS

    NicklasPS Thread Starter

    Joined:
    Aug 15, 2011
    Messages:
    5
    Hi guys,

    A conundrum for you. I've worked on a Sony Vaio VPCF1 where both USB 2.0 ports did not receive power. Neither was damaged.

    - Windows 7 (x64) did not in any way acknowledge a connection, not even in failsafe mode, with any device of any type.
    - Device manager and DxDiag did not see any problems with the USB, and listed both ports normally.
    - I tried uninstalling and completely removing all USB instances in device manager, and reinstalling them. No luck.
    - I checked the registry for invalid USB entries, and found none.
    - I updated BIOS and chipset drivers.
    - I checked powersettings for the USB, and made sure they weren't shut down in any way.

    I then finally took it apart and reset the cables, even though everything seemed perfectly fine. I deliberately left it without any power for about 12 hours. After powerup the system clock had reset from power shortage, and both USB ports now worked perfectly.

    So...what could do something like this, and why would draining the power solve it??

    All the best,

    Nick.
     
  2. leroys1000

    leroys1000 Banned

    Joined:
    Aug 15, 2007
    Messages:
    6,319
    If the system clock reset,then the cmos battery on the motherboard
    is dead or the cmos clear jumper was left in the clear position if you
    have recently used it to clear the cmos and reset the bios.
    A dead cmos battery can cause hardware detection problems.
     
  3. NicklasPS

    NicklasPS Thread Starter

    Joined:
    Aug 15, 2011
    Messages:
    5
    Thanks, I'll look into that.
     
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