when my computer is inactive for approximately five minutes, the screen blacks out, every so often, when I return to my computer with the screen in this state, moving my mouse does not cause the screen to activate again, and I have to activate it by hitting the power button on my computer, however, sometimes this starts to shut my computer down, and when that happens, I lose my saved information that I was working on, this really upsets me, as I often write long posts that take a lot of think work on the part of concepts conveyed and the words used to describe them to the reader. I really hate this situation, how to fix it? do I need a new computer or a new OS? I do not have a lot of money.