I've got a 15" iMac flat panel and was using aiport for my internet connection. Early this week I needed to use its ethernet port but I think it is damaged *I've connected the mac to a router and the led port on the router doesn't go on when I connect it. How can I make sure the iMac's port is not working, can I replace it ou fix it? Thanks PS: also got an iBook graphite 366Mhz with a ethernet port damaged *how these things happen? What can I do to prevent it?