If you believe you have a faulty drive, don't give up. I,ve experienced at times where it is something as simple as a faulty connection. I would do the following once you have attempted the above suggestions. This way if you make it worse you know where to look.
Carefully remove ribbon connectors, visually inspect then reinsert.
Remove cards and clean gold fingers with eraser. Dust and grime will cause a loss in current/voltage and failure.
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