I wouldn't shut off the cable - it sounds like, from what you've described, he feels that all that he has is your support and the computer.
Has his doctor considered depression. It is very common to have it in combination with add.
A way out of some types of depression is through success in life and relationship. I think if it were my family member, I'd try to get him and me into some counseling or set up lots of supports so he can figure out what he wants, and how he can get it. maybe he feels hopeless and incapable... why try if you can't do anything worthwhile anyway.
I've gone searching on the internet and found a promising article for parents of grown children with ADD. Hope this might help you understand the situation more.
Good luck.
thanks so much for the post. I did check out the web site and printed the articule, it has some good information that I will try. My Son is really a good guy and I know he needs all the help he can get. He is on antidepression meds thats what the Mirtazapine is. The Doctor said its a new med and has less side affects. Once again thanks. Sassy