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Thread: MacBook Pro runs very slow when unplugged

  1. #16

    Member Since
    Feb 23, 2012
    just wanna say sorry for bein a d-bag. thanks for the help and advise. frustration had set in.

  2. #17

    Member Since
    Aug 23, 2012
    Fixed this.
    I had this problem with an early 2011 macbook pro. The problem started occuring after about one year of ownership. The problem did not happen in safe mode, but it did occur with the main user account and a newly created login.

    The easiest way to check for the problem was to turn on the activity monitor. Plugged in, 99% of the CPU was available. As soon as I unplugged the CPU availability dropped to <10%.

    Apple tech thought that the problem was software related, but I ran the Apple Hardware Test (the quick and extended version) and it threw a sensor failure code:


    At the apple store diagnostics found the same sensor failure. They replaced the logic board. Problem is fixed.

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