HP 280 G4 Maintenance And Service Manual page 73

Diagnostics reports a failure.
Cause
The cable is not securely connected.
The cable is attached to the incorrect connector.
There is a problem with the cable or a device at the other end of
the cable.
The network controller is defective.
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.
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.
Ensure that the cable is attached to the correct connector.
Ensure that the cable and device at the other end are operating
correctly.
Contact an authorized service provider.
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.
Solving network problems 65