Troubleshooting NICs
When NICs are configured correctly and verified to be working, very little goes wrong with them. When you are troubleshooting a NIC, you should consider the following:
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Resource settings NICs require specific computer resources in order to operate. After you install a card or add new devices, you should check for device conflicts.
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Speed settings If you are not getting the expected speed from the NIC, you should confirm the speed settings and, if applicable, the duplex settings.
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Protocols In order for the NIC to work on the network, it must have a valid protocol assigned to it, and all addressing information needs to be in place.
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Faulty card Some NICs are faulty when they ship from the manufacturer, and some are damaged through poor handling. To test for this, you can swap the card with one that is known to be working.