xbox live problem!!!?

My xbox live doesn't work. It will not connect to the internet. I have my wireless internet set to allow other users to use it. My wireless adapter is fine, it is green. I've tried shutting off and turning back on the router. Ive tried manual ip address. And I have tried using a wire and just plugging it straight into the router. I really think it is the xbox thats broken. My old xbox connected fine. Then it got the RROD. I sent it back and got a new one 2 weeks later. I didn't change any internet settings or anything. The new one won't connect at all. And don't give dumb advice like "well have you checked the xbox website". And please for the love of god don't say "dude I have the same problem." I want an answer to this. I guess if all else fails I could sue Microsoft for their shitty products. I have a 1 year xbox live card running and this new xbox has wasted 4 months of it. I am so pissed at Microsoft right now!