Hey I think I might have the exact same problem, when my computer first failed I took it into the Apple Store and thy said it was my hard drive. I replaced my hard drive with a ssd with no luck getting it started, I just replaced my hard drive cable and it boots up the same. I later tried plugging my old hard drive into a sata USB cable into a different computer just to see if the hard drive still worked and I could read and write files off of it so I am not completely sure that the drive is actually dead. Could you forward me to a guide that explains/shows what you did?
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