USB hub power powering CPU fan

Discussion in 'Computer Support' started by Saddles, Jun 9, 2004.

  1. Saddles

    Saddles Guest

    I recently had to force a shutdown after a freeze. Held in the power
    button. It was something for which I thought I also ought to disconnect the
    power to the CPU for a while. When I pulled the plug I heard the CPU fan
    still going. It freaked me out until I realized that the only power had to
    be coming from the powered USB hub I had plugged in. Pulled that, and the
    fan stopped. Pushed back in the USB power and the fan started again.
    Is this normal? Should the USB power adapter be powering the CPU fan? I've
    left the USB unpowered since then (it works fine), because I don't want to
    take chances.
    Saddles, Jun 9, 2004
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  2. Saddles

    Toolman Tim Guest

    While I've never used a powered hub, I would be very suspect of that
    behaviour. NO device should be forcing power back up the line to the PC.
    Toolman Tim, Jun 10, 2004
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