Hey guys

one of my 2600 routers has a bad ethernet port. I think. When i connect it to a switch the light on the port wont come on. In my other 2600 the light comes on when i plug it into the switch. I have tried different cables with no results. Is there anything i can do to make sure that the port is actually bad. I just want to make sure I'm not missing anything.
Thanks for the help