I was given a MacBook Pro Mid 2012 from a friend but it wont detect any internal hard drive but will boot fine from USB and will recognize a cd put in the DVD drive and I can hear the hard drive spin up when the Mac is booted.
I have tried 2 WD Blue HDDs and a 860 QVO Samsung SSD so I don't think it is the fault of the hard drive and I have also tried a Mountain Lion installer and the Catalina installer.
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More than likely this is an issue with the hard drive cable itself. This particular model is known for that cable becoming faulty. It's a pretty inexpensive fix, and honestly, I usually recommend people replace this cable when they do hard drive upgrades/replacements anyways, just to avoid it being an unforeseen issue.
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Thank you! This seemed to be the problem I got a new one coming now but I managed to temporarily get it working by taping the cable down for the time being :)
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