clamshell problems

This night I came home from a party dj-ing with my macbook pro 13" early 2011. And I like to turn my external screen to my bed and watch a movie/youtube/... So normally I use "clamshell mode" because I don't need the internal screen and there just isn't enough room. But for some kind of reason it isn't working. It isn't the keyboard cause if I keep my mbp open it wakes immediately if I type on my external keyboard. I rebooted already and ... yeah, for me this is just a real pain in the a**. So if anybody knows somzthing about this problem and can help me. I would be very happy.
peace

 

How do the delete this? I already found out. Electricity wasn't plugged in.

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@4god: I just found out, but thanks