Teens with Aspergers/HFA and Their Struggles

"My 17 y.o. son with high functioning autism is an emotional mess. He hibernates in his room playing video games, refuses to eat with the family, seems very depressed, doesn't talk to us even when he is out of his bedroom, has no friends that we are aware of, has completely given up on school (he will go, but we heard from teachers that he simply puts his head on his desk and naps during class; also does not do a lick of homework anymore). We are worried that he may even be suicidal, as he has mentioned that he 'hates life'. Where do we go from here?"
 
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