Hello Everyone, I am having a major problem, and I am very confused by it and a very lost. I had Bootcamp installed and recently it failed resulting in me not being able to login to Windows and OSX as well. So I decided to delete the partitions and reformat the SSD and install just OSX. However, every time I tried to install it failed. So after various testing etc, I thought it might the SSD may have become faulty. So I physically took out my SSD and put in the SSD from a friends MacBook Pro's which was from the same year just to test. Even with his SSD inside my MacBook Pro it gave me the error message saying "no bootable device found..." or something like that. When I held down option key, it let me choose the HD and the OSX loaded with his SSD. But that is not a working solution. I have disconnected the battery and also done an SMC reset, and I am now truly confused in terms of why the laptop is behaving this way. I am beginning to wonder if the logic board is damaged. Its become very frustrating. Has anyone out there seen something like this or know whats going on? I would so appreciate some help or advice. Getting very desperate now. Please help if you can? Thank you.