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There should be a led next to the nic port, this should be on when the cable is plugged in, or on your router led on, this means the cable is good. The actual nic could be bad, did you look in devices in hardware in system in control panel to see if there are errors ? try a different port on the router. you may want to take just the box ( pc) that will not connect and switch with one that will, that will tell you if it is that cable backbone or the pc.
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