I've been having a problem with my screen freezing lately. The arrow still moves but I can't do anything else. I believe it only happens when I'm using Safari. Don't recall it happening any other time. It's almost daily sometimes. I have to manually shut the computer down then restart it. Everything works fine until it happens again. I was looking at a site five minutes before this post. Went to scroll up quick then it happened again. Any ideas? Thanks!