My xbox 360 does not seem to be detecting the wired connection any longer. The xbox is plugged directly into the modem and always has been. It has functioned perfectly previously in this exact setup. Now, upon boot, does not detect internet connection. Selecting 'Wired' connection in Network Setup prompts the following message 'To use a wired Internet connection, make sure an Ethernet cable is connected to both your console and your router or modem.' without allowing me to go any further with the network test. I've seen this problem with multiple ethernet cables that I know work, so it is not the cable. I've plugged other devices into the modem and they all seem to work, so I don't think it's the modem. I've also tried plugging into various ports on my router to see if that would work and it does not. Does my xbox have a problem with the ethernet card?