Shut down compter, unplug router and the ISP modem, Check ALL cables and reseat ALL connections, plug in the ISP modem allow it to selftest, plug in the router allow it to selftest. Reboot the computer, plug in Ethernet cable.You didn't give much info to work with. Wired? Wireless? Does it connect to other devices? What is the OS? Vista? Is this a recent issue? What it the router Make ,Model? Open the Network and Sharing Center, Manage Network Connections, Is the Ethernet Adapter enabled?
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Shut down compter, unplug router and the ISP modem, Check ALL cables and reseat ALL connections, plug in the ISP modem allow it to selftest, plug in the router allow it to selftest. Reboot the computer, plug in Ethernet cable.You didn't give much info to work with. Wired? Wireless? Does it connect to other devices? What is the OS? Vista? Is this a recent issue? What it the router Make ,Model? Open the Network and Sharing Center, Manage Network Connections, Is the Ethernet Adapter enabled?