HP Compaq Presario,Presario R4000 Maintenance And Service Manual page 56

Troubleshooting
Flowchart 2.20—No Network/Modem
Connection
No network
or modem
connection.
Network
or modem jack
active?
Y
Digital
line?
N
NIC/modem
configured
in OS?
Y
Disconnect all
power from
the notebook
and open.
Reseat NIC/modem
(if applicable).
2–28
N
Replace jack
or have jack
activated.
Y
Connect
to nondigital
line.
N
Reload
drivers and
reconfigure.
Network
or modem
connection
working?
N
Replace NIC/modem
(if applicable).
Network
or modem
connection
working?
N
Replace
system
board.
Maintenance and Service Guide
Y
Done
Y
Done