Solving General Problems - HP ProDesk 400 G2 Small Form Factor Maintenance And Service Manual

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If you have installed an operating system other than the factory-installed operating system, check to be
sure that it is supported on the system.
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If the system has multiple video sources (embedded, PCI, or PCI-Express adapters) installed (embedded
video on some models only) and a single monitor, the monitor must be plugged into the monitor
connector on the source selected as the primary VGA adapter. During boot, the other monitor
connectors are disabled and if the monitor is connected into these ports, the monitor will not function.
You can select which source will be the default VGA source in Computer Setup.
CAUTION:
system board. You must disconnect the power cord from the power source before opening the computer to
prevent system board or component damage.

Solving general problems

You may be able to easily resolve the general problems described in this section. If a problem persists and
you are unable to resolve it yourself or if you feel uncomfortable about performing the operation, contact an
authorized dealer or reseller.
WARNING!
board. To reduce the risk of personal injury from electrical shock and/or hot surfaces, be sure to disconnect
the power cord from the wall outlet and allow the internal system components to cool before touching.
Computer appears locked up and will not turn off when the power button is pressed.
Cause
Software control of the power switch is not functional.
Computer will not respond to keyboard or mouse.
Cause
Computer is in Sleep state.
System has locked up.
Computer date and time display is incorrect.
Cause
RTC (real-time clock) battery may need to be replaced.
NOTE: Connecting the computer to a live AC outlet prolongs the
life of the RTC battery.
74 Chapter 6 Troubleshooting without diagnostics
When the computer is plugged into an AC power source, there is always voltage applied to the
When the computer is plugged into an AC power source, voltage is always applied to the system
Solution
1. Press and hold the power button for at least four seconds
until the computer turns off.
2. Disconnect the power cord from the electrical outlet.
Solution
To resume from Sleep state, press the power button.
CAUTION: When attempting to resume from Sleep state, do not
hold down the power button for more than four seconds.
Otherwise, the computer will shut down and you will lose any
unsaved data.
Restart computer.
Solution
Reset the date and time under Control Panel (Computer Setup
can also be used to update the RTC date and time). If the problem
persists, replace the RTC battery. See the Removal and
Replacement section for instructions on installing a new battery,
or contact an authorized dealer or reseller for RTC battery
replacement.