Strange Internet Problem?

Hi, recently I have been having problems with the WiFi in my room. I have tried four different devices (An ipod, a tablet, an Xbox, and a PS3) and all of them seem to exhibit the same problems. They all show full strength connections to the WiFi, but act as though they have no connection to it. Any time I try to access a website or download something, they just fail. My PC is also connected to the WiFi and is right across the hall but it works fine. I also have a pair of wireless headphones that work outside 30+ feet from the receiver, but give up as soon as walk across the hall into my room. I thought there might be some kind of weird Faraday cage effect going on, but I figured my devices wouldn't get any signal if that was the case. The WiFi works fine in the rest of the house. Any ideas?