HT204904: How to reinstall OS X
Learn about How to reinstall OS X
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Helpful answers
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Mar 9, 2016 10:38 AM in response to HafsaAby OGELTHORPE,The HDD may have failed. Take the HDD out, install it in an enclosure and connect it to the Mac via USB. Use startup manager to boot the MBP:
https://support.apple.com/en-us/HT204417
If no HDD icon appears, the HDD is probably dead.
Ciao.
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Mar 9, 2016 11:18 AM in response to HafsaAby KimUserName,Hi HafsaA:
Your problem could be the hard drive SATA cable may have failed.
MacBook Pro 13" Mid 2012 Hard Drive Cable Symptoms: Symptoms
MacBook Pro hard drive SATA cable issue. MacBook Pro Hard Drive Cable Failure-Free fix and preventative maintenance
MacBook Pro blinking question mark issue. MacBook Pro Question Mark Issure
If your SATA cable is faulty, here is a guide on how to replace it.
MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable Replacement: iFixit.com
MacBook Pro 13" Unibody Mid 2012 Hard Drive Cable: SATA Cable
If a flashing question mark appears when you start your Mac: If a flashing question mark appears when you start your Mac it means your Mac can’t find its system software. Hold down the Option key. If you don’t see any volumes, wait a few moments for the Startup Manager to finish scanning connected drives. Select the Recovery Volume and use Disk Utility to try to Verify/Repair the disk. If you have an SSD connected then let it sit like that for 15-20 minutes to allow for garbage collection.
Check Hard Drive Health of a Mac with Disk Utility: Check Hard Drive Health of a Mac with Disk Utility
You can also remove your hard drive from Mac and install in an external enclosure OWC external case or using a USB to SATA adapter USB to SATA adapter and connect it to your MBP via USB. And then try to boot from it using Startup Manager. This will help to identify if your hard drive or SATA cable are at fault. If it boots the MBP, most likely the problem will be the drive SATA cable needs to be replaced.
Boot from the disk using Startup Manager: How to choose a startup disk on your Mac
Kim