Chosen Solution
All of a sudden my Macbook froze and after restarting the file with the question mark came up. I tried to load the HDD but it was missing. Since the SSD doesn’t have a cable to connect, is it probably a bad SSD? Update (08/12/2016) I tried to boot it up with the alt key pressed but it gives a black screen with the apple and then a circle with a cross through it. I can’t reinstall because it gives an error and says to reboot only to restart and get the black screen again. I have a TimeMachine backup available but it will not allow me to reinstall. Update (09/17/2016) I ordered a new Flash Drive via OWC and installed it, now my Macbook Pro is working like new! It was rather expensive for the new drive but instead of bringing it to a Shop and spending even more, I followed the instructions from this site and the install went off with out a hitch.
hello, probably the operating system has lost the boot files, should not be physically dead. try to start up your Mac with the alt key pressed and you boot from the recovery disk, then repairs the permissions and disk by disk utilities. in last chance by reinstalling the operating system, only the system files I think he asks. whereas if you have a TimeMachine backup available, you can also do a clean install
You will need access to another Mac, but try using disk maker X on another Mac. You can make a bootable usb to reinstall el captain or whatever os you had.
