Hello Mac Gurus, I have a problem.. My Mac freezes up occasionally, let's say once in a week. Nothing is working when it freezes up. (mouse, caps lock, nothing) It may even happen while playing a movie, so the sounds keeps repeating over and over again. And I had to reset my mac 21.5" from the "turning on" button. So, what do you suggest me to do? It was happening when I was using Mountain Lion and now it's happening on Mavericks, too. So, since I bought this machine, I'm living with it. Any recommendations? Thanks a lot.