Cannot start from internal but can from external hard drive

Discussion in 'MacBook Pro' started by aduffy32, Apr 22, 2013.

  1. aduffy32 macrumors newbie

    Joined:
    Jul 7, 2008
    #1
    Hey all.

    My macbook did not turn on one day. It was stuck on the apple sign with the loading pinwheel. I tried to repair the hard drive. No luck. I bought another internal hard drive and it wasnt able to be formatted. It kept giving me a "unable to format last block" error. I figured it was a bad new drive so I bought a different one.

    The different one i bought gave me unable a different error. I went out and bought an SATA enclosure. I was able to start ALL the hard drives I had on my other mac. I tried to install OS X mountain lion on one of the hard drives in an enclosure and it worked fine. After Mountain Lion was loaded, I put it back into the mac and it did not want to start. It recognized the hard drive in there and everything. but did not start.

    I then plugged it in externally and it booted fine. Anyone know what the issue could be?
     
  2. ColdCase macrumors 68030

    Joined:
    Feb 10, 2008
    Location:
    NH
    #2
    Beside bad ribbon cable, bad connection, failed motherboard... I dunno.

    Which model/year MB do you have? Any upgrades?
     

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