At startup MacPro, "alt-key" does not work

Discussion in 'Mac Pro' started by macpro20, Feb 27, 2011.

  1. macpro20 macrumors newbie

    Feb 26, 2011
    My MacPro have OSX 10.6.6 and have two OSX's each on an apart Hard Disk.
    One system I use for the regular things and the other system I use only for video-editing.
    Always could I choise for the system I want on that moment, by hold pressing the "alt-key" on startup of the Mac pro, till an menu appears where I could click on the HD I want to use.
    Yesterday I have got an Update for OSX and have allowed to install that update.
    But now works the "alt-key" not more, after a while pressing the alt-key the Mac do nothing, everything stays black.
    Have anyone an idea how this comes and what to do on it to resolve the problem?
  2. gullySn0wCat macrumors 6502

    Dec 7, 2010
    System Preferences > Startup Disk then choose which HDD you want to boot off.

    If you want to choose by pressing alt, try a PRAM and SMC reset, they might help.
  3. triceretops macrumors regular

    Feb 28, 2003
    PRAM reset should fix it

    I had the same problem and resetting pram solved it:).
  4. Macsonic macrumors 65816


    Sep 6, 2009
    I also encountered this situation when the option key does not work and found out the keyboard was defective and had an electrical ground. Those with the thread starter might be a dfferent situation.

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