I have a 2007 macbook pro connected to a 30 inch acd, installed snow leopard with no problems or so I thought. The problem I'm having is that using my macbook pro connected to my cinema display upon booting my computer will try to sleep shortly after booting, never had this problem before and it's very strange. I use a bluetooth mouse which seems to momentarily wake it but it's like it gets caught in some sleep then wake loop. The only way to make it work is to plug the magsafe in and everything works fine. Very frustrating, any help would be greatly appreciated. Oh and I did try resetting the pram.