This disk cannot be used to startup your computer?!?

Discussion in 'OS X Mountain Lion (10.8)' started by Blakeasd, Jul 25, 2012.

  1. Blakeasd macrumors 6502a

    Joined:
    Dec 29, 2009
    #1
    Hello,

    I just purchaed Mountaion Lion, but I can't install it. The installer keeps saying "This disk cannot be used to startup your computer" even though I am using that disk right now. I tried making the partition smaller, like the support document said when updating from SL to Lion -- I am going from Lion to ML. I checked to see if my MacBook is supported and it is. Maybe it has something to do with my computer not having a Recovery partition (I was trying to dual boot Ubuntu [unsuccessfully] and ended up messing with a bunch of drive stuff) Can somone please help me, I'm stuck!

    I am running OS X Lion on a Late 2009 White Macbook

    Thanks.
     
  2. rawdata, Jul 25, 2012
    Last edited: Jul 25, 2012

    rawdata macrumors newbie

    Joined:
    Jul 25, 2011
    #2
    Same here. MBP mid-2010. I had reEfit installed but removed before installation.
    Anyone?
     
  3. souloxide macrumors newbie

    Joined:
    Dec 8, 2011
    #3
    Try this...

    I had the same problem earlier.. Finally, after several attempts...

    1. Create a new partition (dont make it too big - i used 128gb)
    2. Erase free space of that new partition (fastest is fine)
    3. Reduce partition size of the original mac hd (approx 128mb.. Could be more)
    4. Re-install mountain lion and it should work (hopefully)

    I think you can interchange step 2 and 3.. Probably doesnt matter

    Good luck!
     
  4. rawdata macrumors newbie

    Joined:
    Jul 25, 2011
    #4
    Just a quick update on this, I've used this solution http://support.apple.com/kb/TS3926 and it worked for the install.

    Now can't get my partition back to normal size and the volume keys stopped working....
     

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