Sadly, it seems your parents don't care too much about it, and trying to talk with them more times will be like wasting precious time. You should try later, of course, but the priority right now is your brother.

Getting off their whole videogames could end in something worst. First, try controlling the time he plays. For example, if he plays 7 hours a day, control him to play only 6-5 hours. Also, talk with him, not about how he has to quit videogames and never mention about it, but about other actvivities like soccer (which he likes). By doing this, is probably that he start to re-pick interest in their old things.

If you like to go to partys, concerts, reunions or some kind of events, invite him. He needs distractions. If you are at school, or still see your old friends, make a conversation about it. Not about how he must go to school, but try to say how wonderful is/was for you. Maybe, he pick it interest again.

It is a tough situation. And if you think is really bad, try to talk with specialists.

Unfortunately it seems like your parents are the problem in this. From reading it I thought your brother was in his late 20's. i was shocked to find out he is only 15. Your parents need to install strict discipline fast. Get rid of the problem first which in this case are the wii, xbox and pc.

He will go crazy when they do this but after a time he will get over it. At such a young age this is a problem so it would be a good thing to nip this in the bud as soon as your parents can.

There are parental controls on the xbox for a reason, one of your family members really needs to set a limit as to how much time it can be played in a day (which is one of the controls that exist), especially after the TF2 incidents.

Gaming addictions have become more common over recent years so you might get better advice from a specialist centre/website to do with gaming addictions. It will probably help you, your family and your brother better in the long term. I don't know how old you are, but acting as an authoritarian sibling isn't going to go down well with your parents, even if it is necessary.

Also, is your brother anything like the embarassing kid in this video? Maybe your can shock/scare him into doing something by showing it him? 

http://www.youtube.com/watch?v=Lgw2slDfx9Q

you may want to seek psychological help. i know you said your brother tried this before and didn't work, but maybe it wasn't the right therapist for him. is it fundamental that you find someone who your brother can trust and open up with. you also mentioned that he stopped all of his activities before he became a gaming addict, so maybe there's an underling condition of depression and the gaming addiction is only a symptom. it should be worth to try to bring the entire family in treatment because it seems to me that your parents aren't fulfilling their role as authority figures. your whole family mechanics need to be rethought and reworked.

in the meanwhile you shouldn't allow him to ignore school anymore, he's still in time, but if he continues any longer he will endanger his own future.

sorry for the bad english, but it's not my native language

wow they were incredible. thanks for that man.

cases like this would make politicans want to REINSTATE THE MILITARY DRAFT.

BESIDES, EVERYBODY IS ADDICTED TO SOMETHING

I guess he should be monitored more closely. Don't give him anything and see what he does then. His reaction to that would be pretty important.

just take his game away, and slap him around for a bit, that will teach him

lol ^^

As I from a Eastern background, I very familiar with "beating your kids", however you will notice that it was at most a slap or two. Usually when things went beyond that, it made things much worse overall for the parents and the kid. As time goes on it is becoming less acceptable to slap your kid even in immigrant communities.

However I disagree that grabbing your kid or pushing your kid is abuse.

In the West, kids respond very negatively to such actions by their parents.

At his age he would likely do something very stupid, like running away from home or physically assaulting the rest of his family.

As I said with normal kids having parents yell at you and threatening you is usually enough to set you straight.
However, with disturbed kids you have to try the more soft approach.