I’ve got a mid-2009 15-inch MacBook Pro running OS X 10.11.6 It started failing to start up giving errors. Booted off installation disk and ran disk utility. Repair didn’t work. Erase failed. Everyone thought I had a bad hard drive. Bought new Sata hard drive. Installed it (And I’ve done this before successfully). Ran disk utility again. Erase failed again with an input/output error. Does this mean I have a bad cable? Or could it be a worse problem? Can someone point me to the correct cable I can buy please? My Seagate Firecuda Gaming SSHD (ST2000LX001) didn’t come with one. It is 2 TB SATA with 6 GB/s. 2.5 inch with 7mm thickness. Does this mean my old hard drive might be fine too? Thanks so much for any and all help.