That's exactly what I did in the end, and I felt like a bit of a 'tard for not thinking of it sooner...Cook$ if your clamping down your wireless access to your router by MAC address as well as some form of encryption (WEP/WPA etc) you need to put the new mac address in of the machine you have had returned (assuming you got a different s/n one back then you sent off as I did). For some reason the mac address is of the actual x-box and not the wireless adaptor
Hope that helps a bit...
Jose, i don't like Samsung TV's... They look nice, but aren't the best picture...
Toshiba screens are made in the same factories as sony's, and by the same people, on the same production lines.... That's why I went for the Tosh. Cheap Sony imho...