A circle icon Showed up on my screen. After pressing, my screen froze. Help pls

[AC Question]

a small circle icon with an outline of a remote with wifi bars above it. After pressing it, my screen darkened and I coudnt press anything after that. I coundnt restart, turn off or put in my password. Pls help me fix it. And, What is it?

 

[belodion]

Read this:
http://forums.androidcentral.com/showthread.php?t=640046

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