HP ProDesk 400 G1 Maintenance And Service Manual page 88

Table 6-1 Solving Hardware Installation Problems
A new device is not recognized as part of the system.
Cause
Device is not seated or connected properly.
Cable(s) of new external device are loose or power cables are
unplugged.
Power switch of new external device is not turned on.
When the system advised you of changes to the configuration,
you did not accept them.
A plug and play board may not automatically configure when
added if the default configuration conflicts with other devices.
USB ports on the computer are disabled in Computer Setup.
Computer will not start.
Cause
Wrong memory modules were used in the upgrade or memory
modules were installed in the wrong location.
Power LED flashes Red five times, once every second, followed by a two second pause, and the computer beeps five times. (Beeps
stop after fifth iteration but LEDs continue flashing.)
Cause
Memory is installed incorrectly or is bad.
80 Chapter 6 Troubleshooting without diagnostics
Solution
Ensure that the device is properly and securely connected and
that pins in the connector are not bent down.
Ensure that all cables are properly and securely connected and
that pins in the cable or connector are not bent down.
Turn off the computer, turn on the external device, then turn on
the computer to integrate the device with the computer system.
Reboot the computer and follow the instructions for accepting
the changes.
Use Windows Device Manager to deselect the automatic settings
for the board and choose a basic configuration that does not
cause a resource conflict. You can also use Computer Setup to
reconfigure or disable devices to resolve the resource conflict.
To access Device Manager in Windows 7, click Start, select
Control Panel, and then select Device Manager.
To access Device Manager in Windows 8.1, from the Start screen,
type c, select Control Panel from the list of applications, and then
select Device Manager.
Run the Computer Setup utility and ensure that Device available
is selected for appropriate USB ports under Security > USB
Security.
Solution
1. Review the documentation that came with the system to
determine if you are using the correct memory modules and
to verify the proper installation.
NOTE: DIMM1 or XMM1 must always be installed. DIMM1
must be installed before DIMM2.
2. Observe the beeps and LED lights on the front of the
computer. Beeps and flashing LEDs are codes for specific
problems.
3. If you still cannot resolve the issue, contact Customer
Support.
Solution
CAUTION: 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 DIMM module.
1. Reseat DIMMs. Power on the system.