Hey, So I'm trying to replace the hard drive in my friend's 2010 macbook pro. THe hard drive definitely died recently, though it is possible other things died as well. In short: The computer stopped working. I made an install USB, booted from it, open disk utility, I tried to reinstall the OS, and it told me the hard drive wasn't good. So, I had an extra laptop hard drive laying around, so I opened the laptop up, popped it in (I did NOT out in the Torx screws- I just wanted to see if it'd work), and it didn't even show up in disk utility. So, I put the old hard drive back in- it showed up in disk utility, just said it didn't work. At this point, my friend just bought a new hard drive. It came today, and I installed it (again, without the Torx screws). Again, the hard drive does not show up in disk utility. However, the original hard drive still does, it just doesn't work. So, what should I do at this point? Is there some circuit that is complete by ensuring that the Torx screws are in place? That'd explain everything. It recognizes USB drives no problem. Any input would be appreciated.