My ethernet cable doesn't seem to work when I plug it in. The back of the port doesn't even light up. However, when I tried the 'B-link' wireless LAN the B-link lan signal was beeping to show it is working. I've tried using the wcable on another pc and it work fine. Also it is enabled in the bios but it doesn't show up in device manager or in network connections (only wifi shows up). Please help.