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Aporte original por: Dan ,


You'll hitting a known issue. Sorry ;-{

Your problem is the SATA cable has failed. Here is the IFIXIT guide to replace it: [guide|7655|MacBook Pro 13" Unibody Late 2011 Hard Drive Cable Replacement].

To prove it you could use your external case with your original HD in it and then boot up the system holding the Option key to get to the boot manager. At that point you could select your external drive to boot the system thus, bypassing the bad SATA cable.