Rev A USB problem

Discussion in 'MacBook Air' started by diminiko, Aug 26, 2011.

  1. diminiko macrumors member

    Joined:
    Jun 30, 2010
    Location:
    London
    #1
    I have had rev A MBA for 3+ years. Today I plugged in a externally powered blu-ray burner and had a warning along the line of "USB device trying to draw too much power and will be shut down".

    Since then, no USB devices will work off the USB port.

    I have tried:

    1) Reset PRAM & VRAM
    2) Reset SMC
    3) Diagnostic tool test- won't boot into diagnostic test when holding D at boot and obviously can't boot of superdrive! I don't have another computer handy to do remote disk access for this.
    4) Booting into safe-mode made no difference

    I am out of extended warranty so can't call Apple for help.

    Any suggestions welcome before I bite the bullet and take it to the genius bar!
     
  2. blevins321 macrumors 68030

    Joined:
    Dec 24, 2010
    Location:
    Winnipeg, MB
    #2
    I had this same problem with an external BR on my 2009 iMac. It also throws the same error with my brand new MBA. Maybe there are some drives that are totally incompatible? It was an external LG drive in an optical enclosure.

    I grabbed one of the small laptop-sized USB-powered ones though and it works like a charm.
     
  3. diminiko thread starter macrumors member

    Joined:
    Jun 30, 2010
    Location:
    London
    #3
    Thanks, but my problem now is that the USB port has stopped working altogether. Not even a thumbdrive will work.
     
  4. diminiko thread starter macrumors member

    Joined:
    Jun 30, 2010
    Location:
    London

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