Hi guys,
I got a MBP late 2011 and a mid 2012. I bought a samsung 860EVO SSD drive to upgrade my late 2011 MBP but when I try to boot I got a flashing folder with a ?. If I put back the old hard drive it boot as usual, slow but efficient… As I was reading this thread I decided to install my sata cable from the mid2012 MBP (which is working fine) in the late 2011 in order to see if it could solve the problem and if I would buy one, but I still have the *!&*^#% flashing folder… Do you have any suggestion ?