I posted that earlier today and got some really good advice from some people (thanks again) But I'm being told that I might need to replace the Logic Board on my macbook. Does anyone out there know how much one would cost ( i know the apple store will rape my wallet). And can anyone offer anymore advice?? Also one thing i forgot to mention was that when I open my computer from sleep mode there is a loud hissing sound/pshhhhhh sound. ...any help on that issue and the above will be greatly appreciated!