1. In the Windows system, enter the Device Manager and check if there is an Ethernet controller in "Other Devices". If there is, it indicates that the hardware has been recognized and the driver has not been installed yet. Simply install the driver;
Linux system uses the lspci | grep - eth command to check if there is a card corresponding to the chip. If there is, it indicates that the hardware has been recognized and no driver has been installed. Simply install the driver.
2. Is the network card installed in the wrong slot (for example, if the PCIe interface network card is installed in the PCI slot, correct it);
3. On a multi CPU server, when encountering an underfilled CPU, the network card happens to be installed in the slot without CPU control. At this time, it needs to be replaced with the corresponding slot of the CPU that is already installed and working properly. (by replacing the slot);
4. Poor contact with the golden finger (caused by power failure of the device, reinstalling the board and performing two or three insertion and removal operations on the slot before fixing the network card);
5. Insert the network card into another motherboard for testing and verification to check if the network card is faulty.
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