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Message: <blockquote data-quote="MacInWin" data-source="post: 1775361">Oh, and passing the hardware test is not a valid confirmation that the GPU has not failed, or does not have issues. I had a "failed" GPU that only manifested when it switched from low graphics to high graphics, at which time the screen went black and the system became unresponsive. But if the hardware test didn't even see the HD as a device, then the drive sounds to be dead, dead, dead. Or the cable is broken, broken, broken. Or both. You said in the first post the drive was new, so it's either the cable or infant mortality on the drive, I suspect.BTW, Apple replaced the logic board in my MBP under an extended warranty but now that program has ended.</blockquote>