Hi everyone, My hard drive recently crashed so I decided to buy a new one. Ibought a hybridd HDD/SSD and plugged it into my Macbook pro (mid 2013). I created a bootable USB to install Yosemite, partitioned the HDD, and started the Yosemite install. Everything went well, I could boot up to the desktop, connect to the internet etc. I then turned off my computer, and when I turned it back on, I saw the blinking folder with a question mark. I tried reformatting my HDD and installing another OS X, which worked, but once I turned my computer off, I got the same blinking folder problem at startup. I get the impression that everytime I shut down, the HDD is being "reset", and all the information gets wiped. Does anybody know how I should proceed ? Is the HDD or the mac the problem?