2012 MBP (MD101LL/A) Won't Boot from Hard Drive

Discussion in 'MacBook Pro' started by dano0726, Dec 24, 2015.

  1. dano0726 macrumors newbie

    Joined:
    Jul 5, 2011
    Location:
    NW Houston
    #1
    My daughter's 2012 MBP won't boot from either the original 500GB SATA hard drive or the upgraded 500GB SSD whenever either drive is installed in the laptop...

    Luckily, I can start her machine and depress the Option key to be able to boot to the external USB drive (both drives, when installed in the OWC enclosure, work for the external boot) -- I can use the MBP from the external drive...

    She has Yosemite 10.10.3 (on the SATA) and Yosemite 10.10.4 (on the SSD)...

    When I open Disk Utility (on either drive) from the external drive, the hard drive doesn't appear....just the external drive and a grayed-out SuperDrive

    Please help -- what do I look for? Hardware or software
     
  2. T5BRICK macrumors 604

    T5BRICK

    Joined:
    Aug 3, 2006
    Location:
    Oregon
    #2
    The SATA cable may be bad. It's a fairly easy repair and an inexpensive part. I'd try it.
     
  3. dano0726 thread starter macrumors newbie

    Joined:
    Jul 5, 2011
    Location:
    NW Houston
    #3
    T5Brick -- thanks for the help...ordered the replacement cable
     

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