Cannot start from internal but can from external hard drive

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

  1. aduffy32 macrumors newbie

    Jul 7, 2008
    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

    Feb 10, 2008
    Beside bad ribbon cable, bad connection, failed motherboard... I dunno.

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

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