I hope this is an appropriate forum in which to ask this question. My computer has been running extremely slow lately, and today I had to restart several times. Then... it wouldn't turn on. At all. Finally I got it to turn on, but on the grayish/blue screen in place of the apple was the symbol from the no-smoking sign. (I have no idea what that symbol is actually called, but you know what I'm talking about.) This happened several times. Finally, I got it to turn on and I'm attempting to backup all of my files onto my external. (Considering it's finals week, I would have a mental breakdown if I lost them!) I will hopefully have no more issues, but I was just curious what that symbol means and if there is anything I can do to remedy the problem. If it continues, I will obviously take my computer to the Apple store, but I'm hoping it's something I can fix myself. This is my first Mac, which I purchased in November of 2006. I have not had any problems with it. When I would have really bad problems like this with my old Windows computers, I would reformat the drive and then reinstall everything, but I have no idea how to troubleshoot problems with my Mac, as I have never had them! Anybody care to share some knowledge to a Mac newbie?