It's worth checking that the laptop actually works as per spec. I just replaced a Mid-2012 MBP's hard drive cable. It hadn't failed outright, but the system wo

It's worth checking that the laptop actually works as per spec. I just replaced a Mid-2012 MBP's hard drive cable. It hadn't failed outright, but the system would take a very long time to read/write anything from the drive, constantly freezing apps. Once I installed a new cable ($12 off amazon), it's speedy again.