Just got a brand new 15" Macbook Pro for Christmas this year. Recently in the past few days I've been running into this problem. I close the computer, putting it to sleep. When I go to open it back up and use it again, the screen comes on for about a second where I need to enter my password. After about a second the screen then goes black. There is no way to get the screen back on unless I unplug the computer and plug it back in. I've noticed that it has something to do with internet sharing. I use it to send a wifi signal out for my other devices and what not. When it is sharing that wifi is when this problem occurs. It seems when I turn it off internet sharing the problem doesn't occur. Would sharing the connection not allow the computer to correctly sleep or something while closed? It's getting very annoying and I'm wondering if anyone else has had an issue like this. I also tried doing software updates yesterday and the mac got stuck during the update. I had to hard reboot it to start using it again. I'm feeling like this mac may be having some problems. Any advice?