Very Slow and Beachballing

I replaced the Harddrive with a 1T SSD, upgraded RAM to 16GB, and freshly installed a clean boot of ElCapitan. But it's still slow and beachballing.

Any ideas on what to do next?

Answered! View the answer I have this problem too

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Replace the original drive, do not mention the you've been into it. Take it to Apple or an ASP (preferred as they have a financial incentive, Apple will pay them), and ask the to replace the hard drive/IR cable for free.

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I decided to try swaping a hard drive cable from another macbook I had with my laptop. It works amazingly! Thanks for your help.


They should have the cable in stock.


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Denton will be eternally grateful.
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