I hate that I'm having to ask this, because it's been working perfectly fine until now. I use my macbook pro as my home computer and hook it up to an external monitor and keyboard when I'm home. I do disconnect it on occasion. I unplugged it today and when I went to plug it back in and shut the lid, my monitor is saying "no connection." The monitor works fine with the lid open, but I used to be able to close it no problem.