In an effort to make my computer work better, I downloaded many programs and eventually my computer completely stopped working properly. It got to the point where I couldn't turn it on at all and didn't know how to solve the problem. I was lucky, because I had a friend who advised me this guide computer not turning on. I read it carefully and did what it said, taking into account all the points. It really saved my computer. It still lags sometimes, but at least it works.