One should be green (either solid or blinking): Where the network cable plugs into the network card, there are usually 1 or 2 LED indicators.
Verify the presence of a physical connection by ensuring that link LED illuminates when the network cable is connected. AMD Ethernet adapter fails to detect correct duplex mode. AMD fails after upgrade to Windows 2000. Setting an onboard Ethernet controller to RIPL. Setting an onboard Ethernet controller to DHCP. Conflicts between Ethernet adapter failover pairs. Ethernet fault tolerant setup Windows 2000 (Intel chipset). IBM Gigabit Ethernet fault tolerant setup Windows 2000. IBM Gigabit Ethernet adapter errors (failure to ping, packet loss, or system hang) under SUSE LINUX 8.0. Troubleshooting the 100/10 PCI Ethernet controller. If your issue is listed, select the link, otherwise proceed to step 2. To begin troubleshooting, check the following top issues. inferior, damaged, or disconnected cabling. inefficiently configured routing tables, or router faults.