HP EliteDesk 800 G4 SFF Maintenance And Service Manual page 108

Diagnostics passes, but the computer does not communicate with the network.
Cause
Network drivers are not loaded, or driver parameters do not
match current configuration.
The network controller is not configured for this computer.
Network controller stopped working when an expansion board was added to the computer.
Cause
The network controller requires drivers.
Network controller stops working without apparent cause.
Cause
The cable is not securely connected.
The network controller is defective.
New network card will not boot.
Cause
New network card may be defective or may not meet industry-
standard specifications.
Cannot connect to network server when attempting Remote System Installation.
Cause
The network controller is not configured properly.
System setup utility reports unprogrammed EEPROM.
Cause
Unprogrammed EEPROM.
100 Chapter 6 Troubleshooting without diagnostics
Solution
Make sure the network drivers are loaded and that the driver
parameters match the configuration of the network controller.
Make sure the correct network client and protocol is installed.
Select the Network and Sharing Center icon in the Control Panel
and configure the network controller.
To access Control Panel in Windows 10, type control panel in
the taskbar search box, and then select Control Panel from the
list of applications.
Solution
Verify that the drivers were not accidentally deleted when the
drivers for a new expansion board were installed.
Solution
Ensure that the cable is securely attached to the network
connector and that the other end of the cable is securely attached
to the correct device.
Contact an authorized service provider.
Solution
Install a working, industry-standard NIC, or change the boot
sequence to boot from another source.
Solution
Verify Network Connectivity, that a DHCP Server is present, and
that the Remote System Installation Server contains the NIC
drivers for your NIC.
Solution
Contact an authorized service provider.