Since I got my iBook a few months ago, it's pretty much all that I have been using. I've just been wondering if this is okay for the computer. I've noticed that it gets really hot after a few hours of work. What about the screen? Can it wear out after a while? Could it being on many hours at a time be detrimental to it anyway? It doesn't seem like it, but hey, for all I know, I could be killing it every time I turn it on.