Hi. I have a specific kind of problem. My Macbook Pro (mid 2012) doesn´t boot from my SSD. But it boots from the old mechanical HD. I made a clone from this old mechanical HD to my SSD and actually I can boot from this SSD when its plugged via USB. I bought a this SSD like tree months ago and everything worked perfectly and I was very happy with it. One day we were streaming Netflix and paused it for getting something and when we came back the screen had went all blank. Since then this problem beginned. I could use as normal my old mechanical HD just put it back in the computer but the SSD didnt boot. I thought the SSD was damaged and I got a new one from warranty and the problem is still there. I tryied diferent things like "option+cmd+r+p", "shift+ctrl+option+power"... I cannot boot the SSD but I can find it in the "recovery mode". AnThis is an anoying problem. Anyone had similiar problems or has any good idéas I could try? "Samsung SSD 850 EVO 500Gb"