[at a skybox of a friend i cant get media at all.i am getting only a white screen on tv]

i can get streaming music at other places and my own skybox but not there-he can though.also all of a sudden when i search im getting web host not found messages..and i cant get utube links etc.i have reinstalled quicktime,adobe flash and shockwave and made firefox my default browser.settings on pref ive checked and rechecked.im so frustrated.please help.