Hi MacRumors. So I am making another thread due to the other one not getting many responses and I was hoping to get this problem solved. I have a macbook pro 13 inch Early 2011 and I recently installed an optical bay hard drive so I could install my old hard drive there and put a SSD into my original hard drive area. Well, the optical bay hard drive works perfectally but I recently attempted to install the SSD into my main hard drive spot and I found out that it was not be recognized. I placed the SSD into an external hard drive bay and it was being recognized perfectly. I then purchased a new hard drive cable thinking that possible the cable might of broke. Well found out that the cable did not fix the problem. Now I have no clue what the problem could be. Why is the SSD being recognized in an external hard drive but not inside my actual computer? I tried switching the HD's (put SSD in optical bay and put original HD into main HD spot) but that didn't do anything either. Thanks for any help that can be given, I truly appreciate it, !