Hi! Yesterday, my MacBook Pro mid-2012 that I got last year in january suddenly became very slow, almost to the point where it was unusable. Today, it didn't even boot. I tried using windows on my computer(which I already had), and since that worked perfectly, I figured it must have been something wrong with OSX, so I tried re-installing it. That didn't work, and it says that OSX can't be installed on my computer. Why does this happen? Does anyone know how to fix it? If my grammar is bad then I'm sorry, but english is not my first language.