Hi! I've got a really strange issue with my Macbook Pro mid 2012. It recently started not letting me login to my user, spinning wheel, freezing. The apple store tested and everything seemed okay so they suggested a new HD bracket and Cable. I bought the new cable (not official) tried it out and it didnt seem to work. So I'm assuming its the HD that is gone. I plug the old cable back in and try to get to recovery, weirdly it works and lets me boot from an old TM backup. Great, but then eventually the same problem occurs again. I try Disk utility in recovery and it says it can't repair, then it says the disk is locked and then it says its not mounted and cant find it. So I try buying a new hard drive, get tyhe flashing folder. Try another HD and get the same. Try both cables with the new hard drives and still the flashing folder. As I'm pretty much about to give up, I plug the original HD in, and see if i can get it working again. Randomly it starts working and now I'm using it just fine. I really can not figure out what the hell is going on? Both the HD's I bought are compatible, so how could neither work? If its the cable, how come it's working with this particular hard drive? Has anyone got any idea what i should do? I'm thinking of buying another cable and bracket and trying with the newer HD, but that aside, I'm stumped. Thanks!