Sounds like you are hitting a bad HD SATA cable [https://beetstech.com/blog/prevent-a1278-mid-2012-hard-drive-cable-failure|Your Hard Drive Cable Is A Ticking Time Bomb]
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Sounds like you are hitting a bad HD SATA cable [https://beetstech.com/blog/prevent-a1278-mid-2012-hard-drive-cable-failure|Your Hard Drive Cable Is A Ticking Time Bomb]. You’ll want to apply a strip of electricians tape down on the uppercase as outlined and you also want to replace the HD SATA cable as well!
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Here’s the needed cable [
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Here’s the needed cable [https://www.ifixit.com/Store/Mac/MacBook-Pro-13-Inch-Unibody-Mid-2012-Hard-Drive-Cable/IF163-041?o=1] and here’s the guide to putting it in [https://www.ifixit.com/Guide/MacBook+Pro+13-Inch+Unibody+Mid+2012+Hard+Drive+Cable+Replacement/10379]
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What you also need to be careful with is not damaging the cable putting it in. Don’t crease the cable, the fold will damage the thin foil wires within it! Instead use an old BIC pen ink straw as a forming brake use it to form a nice radius bend in the cable where it needs to get around the corners.
Sounds like you are hitting a bad HD SATA cable [https://beetstech.com/blog/prevent-a1278-mid-2012-hard-drive-cable-failure|Your Hard Drive Cable Is A Ticking Time Bomb]
Here’s the needed cable [