Solving Memory Problems - HP ProDesk 405 G4 Small Form Factor Maintenance And Service Manual

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.

Solving memory problems

If you encounter memory problems, some common causes and solutions are listed in the following table.
CAUTION: Power may still be supplied to the DIMMs when the computer is turned off (depending on
the Management Engine (ME) settings). To avoid damage to the DIMMs or the system board, you must unplug
the computer power cord before attempting to reseat, install, or remove a memory module.
For those systems that support ECC memory, HP does not support mixing ECC and non-ECC memory. Otherwise,
the computer will not boot the operating system.
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.
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