Troubleshooting Your System 151Troubleshooting a Serial I/O Device1 Turn off the system, including any attached peripherals, and disconnectthe system from the electrical outlet.2 Swap the serial interface cable with another working cable, and turn on thesystem and the serial device.If the problem is resolved, replace the interface cable.3 Turn off the system and the serial device, and swap the device with acomparable device.4 Turn on the system and the serial device.If the problem is resolved, replace the serial device.If the problem persists, see "Getting Help."Troubleshooting a NIC1 Run the appropriate online diagnostic test. See "Using Dell™ Diagnostics."2 Restart the system and check for any system messages pertaining to theNIC controller.3 Check the appropriate indicator on the NIC connector. See "NIC IndicatorCodes."• If the link indicator does not light, check all cable connections.• If the activity indicator does not light, the network driver files mightbe damaged or missing.• Use another connector on the switch or hub.If you are using a NIC card instead of an embedded NIC, see thedocumentation for the NIC card.4 Ensure that the appropriate drivers are installed and the protocols arebound. See the NIC's documentation.5 Enter the System Setup program and confirm that the NIC ports areenabled. See "Integrated Devices Screen."6 Ensure that the NICs, hubs, and switches on the network are all set to thesame data transmission speed and duplex. See the documentation for eachnetwork device.
