Okay so I have a MacBook Pro (Late 2011) I bought new back in March of 2012. A couple months back it started running very sluggish and acting odd. I had windows installed on it as well and it would flag me saying my hdd was damaged and to backup my files. Eventually my Mac would boot to the logo screen, bar would load, and then it would continue to a plain gray screen like you see before the login screen. During this time it would get hot and loud and eventually just shuts down. I assumed my hdd finally bit the dust so I installed a new one today. It’s a Samsung 850 Evo. I installed it and ran the internet recovery. The globe appeared and it downloaded in about 10-12 minutes, which seems fast. After it’s done it goes to the gray screen and does exactly what it did with the old hdd. Does anybody know what the issue could be? Thanks in advance!