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key combination to choose startup disk

815 Views 13 Replies Latest reply: Jan 10, 2013 9:16 AM by andyBall_uk RSS
nfarlow Calculating status...
Currently Being Moderated
Jan 9, 2013 5:41 PM

My Windows partition is hosed. How do I get back to a screen that lets me choose my start-up disk? I can't remember the key or key combination.

 

Thank you,

Nancy

iMac, Mac OS X (10.7.2)
  • Mike Sombrio Level 6 Level 6 (9,070 points)
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    Jan 9, 2013 5:44 PM (in response to nfarlow)

    At startup hold the Option key.

  • Niel Level 10 Level 10 (234,550 points)
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    Jan 9, 2013 5:44 PM (in response to nfarlow)

    Option.

     

    (74018)

  • Mike Sombrio Level 6 Level 6 (9,070 points)
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    Jan 9, 2013 5:45 PM (in response to nfarlow)

    Just noticed that you're using Lion, try Command R at startup to boot not your recovery partition.

  • VikingOSX Level 5 Level 5 (4,695 points)
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    Jan 9, 2013 5:56 PM (in response to nfarlow)

    Boot and hold down the X key. That forces OS X to boot in the presence of other boot partitions.

  • VikingOSX Level 5 Level 5 (4,695 points)
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    Jan 9, 2013 6:14 PM (in response to nfarlow)

    Reset NVRAM which stores the startup disk information.

     

    Hold down shift+command+P+R while booting. Hold this through at least two chimes, and then release. Immediately hold the Option key down to get to the Startup Manager.

  • Murphyrw Level 1 Level 1 (20 points)
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    Jan 10, 2013 4:22 AM (in response to nfarlow)

    Always after the first chime...  Holding the option key down prior to that won't work usually.

  • VikingOSX Level 5 Level 5 (4,695 points)
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    Jan 10, 2013 5:06 AM (in response to nfarlow)

    Glad you are back up and running.

     

    There were two steps to the instructions I gave earlier about resetting the NVRAM.

     

    1. Boot with shift+command+P+R keys depressed. Apple recommends doing this through two chime cycles.
    2. Release shift+command+P+R keys and hold down option key until Startup Manager screen appears.

     

    Step 2 implies that the second chime has occurred, a third reboot is in progress, and now only the option key should be pressed. It was clear to me, but perhaps insufficiently communicated to you.

  • andyBall_uk Level 6 Level 6 (17,470 points)
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    Jan 10, 2013 9:16 AM (in response to nfarlow)

    Resetting NVRAM / PRAM

    1. Shut down your Mac.
    2. Locate the following keys on the keyboard: Command (⌘), Option, P, and R. You will need to hold these keys down simultaneously in step 4.
    3. >>Turn on the computer.
    4. >>>Press and hold the Command-Option-P-R keys before the gray screen appears.
    5. Hold the keys down until the computer restarts and you hear the startup sound for the second time.
    6. Release the keys.

    After resetting NVRAM or PRAM, you may need to reconfigure your settings for speaker volume, screen resolution, startup disk selection, and time zone information. If issues persist, your Mac's logic board battery (not a portable Mac's rechargeable battery) may need to be replaced. The logic board battery helps retain NVRAM/PRAM settings when your computer is shut down. You can take your Mac to a Mac Genius or Apple Authorized Service Provider to replace the battery on the logic board.

     

    you don't press them at the same time as the power button, and it's Option, not shift

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