Hello, I'm not sure if I'm even posting this in the right area, but I really need some help with my Mid 2012 Macbook Pro! I have a 13" with a 2.5GHz Intel core i5 processor. I started having problems about a month or two ago, and so I upgraded the RAM to 8GB and the hard drive to a SSD. This seemed to solve the problem for a short bit, but then the computer began having issues again. Problem 1: Initially the computer started having problems when I would try to put it to sleep by closing the screen and putting it in my laptop sleeve in my backpack. I would open it up several minutes later and the computer was incredibly hot to the touch and would not start up. I stopped using sleep mode and began shutting it down every time I was done using it to prevent overheating. Problem 2: Now my computer will be running fine, then suddenly the screen will freeze and there will be these columns/lines of random boxes all over. The computer won't respond, and then after a moment it will shut off and restart. I have heard I may have logic board issues, but I don't even know where to start or how to tell if that is the case. Any help is greatly appreciated, thank you for your time and expertise!