HP Compaq dc7900 USDT Specifications download pdf (Page 252)

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! When the computer is plugged into an AC power source, voltage is always applied to the

system 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.

Table D-1 Solving General Problems

Computer appears locked up and will not turn off when the power button is pressed.

Cause Solution

Software control of the power switch is not functional. 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.

Computer will not respond to USB keyboard or mouse.

Cause Solution

Computer is in standby mode. To resume from standby mode, press the power button or

press any key.

CAUTION: When attempting to resume from standby mode,

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.

System has locked up. Restart computer.

Computer date and time display is incorrect.

Cause

Solution

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.

First, 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

Hardware Reference Guide for instructions on installing a new

battery, or contact an authorized dealer or reseller for RTC

battery replacement.

Cursor will not move using the arrow keys on the keypad.

Cause Solution

The Num Lock key may be on. Press the Num Lock key. The Num Lock light should not be on

if you want to use the arrow keys. The Num Lock key can be

disabled (or enabled) in Computer Setup.

240 Appendix D Troubleshooting Without Diagnostics

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HP Compaq dc7900 USDT Specifications Page 252