My Problem
A friend's MBP was becoming extremely pokey, with pinwheels at every turn. The unusually long process of running diagnostics came up with no specific issues... and then I stumbled upon someone mentioning online that this model was notorious for hard drive cables going bad — often due to rubbing against the brushed metal of the inner case. Lo and behold, some electrical tape around the cable improved the issue dramatically! But it didn't fix it completely, so off to a replacement I went.
My Fix
The repair went off without a hitch. This was my first time attempting such a feat, and the result was like a brand new computer.
My Advice
To help prevent future issues, apply a strip of electrical tape to the casing underneath the hard drive cable! This will reduce the friction and therefore hopefully any future abrasions.
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