Zehavasdad, my daughter has been out of the house for several years and I think it improved our relationship, B”H. Why should I shun my daughter? I could never do that. My heart and home is always open to her.
writeorwrong, I really feel for your situation. I am wondering if his teachers/Rebbe/principal know about what your son is up to these days. Are you able to talk to them and tell them that your son needs some chizzuk?
I am also wondering why your son wants the computer if it doesn’t have internet. having been in your position, let me warn you that OTD kids learn to be very sneaky and you need to be very wary. You do not have to give or share your computer with him. He can get a job this summer or find ways to earn money to buy his own computer. That is my opinion but you of course should ask daas Torah.