Can't boot into 64-bit mode

Discussion in 'macOS' started by bailorg, Mar 9, 2011.

  1. bailorg macrumors member

    bailorg

    Joined:
    Dec 16, 2008
    #1
    I'm have a 2008 aluminum unibody Macbook with EFI64 (yes, I double-checked)

    I just upgraded to 8gb of RAM and I am trying to run Rember to test the memory.

    However, in 32-bit kernel mode, Rember returns a "memory lock" error because my system has over 4gb of RAM.

    I have tried shutting down and holding 6 and 4 and then pressing the power button, but every time I do this, the system still boots into 32-bit mode.

    Is there a proper time to hold down 6 and 4?

    Do I press them before or immediately after pressing the power button?

    When can I let them go?

    Are there drivers or programs starting on login that prevent the system from booting into 64-bit mode?
     
  2. MarkMS macrumors 6502a

    Joined:
    Aug 30, 2006
    #2
  3. Ramasjang macrumors member

    Joined:
    Feb 22, 2009
    #3
    Hi

    I have a late 2008 2GHz macbook also with 8GB ram...

    I can't boot into 64bit neither.

    Any help out there?
     
  4. atlanticza macrumors 6502a

    atlanticza

    Joined:
    Jul 18, 2008
    Location:
    Cape Town
    #4
    Hold down the '6' and '4' keys when the Mac starts up (until the Apple log). After starting up in 64-bit mode, check About This Mac…, click More Info, then click on Software. In 64-bit mode there will be a yes next to 64-bit Kernel and Extensions.

    If not, see if this helps http://support.apple.com/kb/ht3696
     
  5. alust2013 macrumors 601

    alust2013

    Joined:
    Feb 6, 2010
    Location:
    On the fence
    #5
    The aluminum MB needs some sort of hack to use 64-bit kernel, and will not work with the default 6 and 4 key startup
     
  6. bailorg thread starter macrumors member

    bailorg

    Joined:
    Dec 16, 2008
    #6
    Is there some reason for this beyond "Apple said so"?
     

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