[mariec99]

My first thought is to put the computer in a main room of the house - anywhere but the kid's bedroom. That might have a dampening effect on any inappropriate PC use.

Same with phones. There is no good reason why a kid needs a phone extension in their bedroom. (Although these days, kids have cell's so I don't know if this would work.)

He'll be driving next year, so maybe now is the time to sit him down and say something to the effect of -- "You have the POTENTIAL of getting a big privilege when you turn 16. So, I'l be watching your behavior until then to determine what level of responsibility you can handle." Then lay out some ground rules. Curfews. Call when he will be late. Checking in regularly. Maintaining or improving grades. Sort of "if you want X, then I need to see X
behaviors".