The hard drive was fine. But I needed a HDD cable too.

My Problem

My computer wasn't booting well, and I was running low on space.

My Fix

Initially it seemed like it went well. I installed the HDD, restored my system from backup. But then the system would lock up. I needed to replace the HDD cable too.

My Advice

You will probably need to do this too. MacBook Pro 13" Unibody (Mid 2009/Mid 2010) Hard Drive Cable / With Bracket / New