Hello everyone! I have a problem with my Macbook pro mid 2012 13". The problem is that a folder with a question mark in it keeps on popping up each time I boot up my laptop. It all started one day when my laptop froze and crashed after a few seconds, and when it booted itself up again, the folder came up. I brought in my laptop to my universities tech center to get a diagnosis and after a few tries to reset the laptop, they came to a conclusion that it was a hard drive failure. So they told me to get a new hard drive. The one recommended to me was the Samsung 850 Evo 2.5". So I bought one, and in the process of installing the new ssd, they STILL came across the folder with a question mark. The head of the tech department told me that it's most likely the SATA cable, but before I make any unnecessary purchases, I wanted to confirm if there really is a problem with the SATA cable or anything else. Sorry for the long read but thanks for the help!