HP COMPAQ DX2718 MT - Manual (Page 82)

D–2 483941-001 Service Reference Guide
Troubleshooting Without Diagnostics
Solving General Problems
You may be able to easily resolve the minor 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 your HP authorized reseller or service provider.
Problem Cause Solution
Computer will not
turn on. Cables to the external
power source are
unplugged. Ensure that cables connecting the
computer to the external power source
are plugged in properly and the wall
outlet is active.
Voltage selector switch on
the rear of the computer
chassis is not switched to
the correct voltage (115V
or 230V). Select the proper AC voltage using the
slide switch.
A defective PCI card has
been installed. Remove any expansion board that
was just installed.
Drive data or power supply
cables may not be
properly connected. Reseat drive data and power supply
cables.
The unit temperature was
exceeded. The fan may be
blocked. 1. Unit is in an exceedingly hot
environment. Let it cool down.
2. Ensure that computer air vents are
not blocked and the internal fan is
running.
3. Contact an HP authorized reseller
or service provider.
Computer appears
locked up and will not
turn off when the power
button is pressed. 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. Computer is in
standby mode. Press the power button to resume from
standby mode.
Keyboard or mouse is not
connected to computer. Connect keyboard and mouse cables
to computer.
System has locked up. Restart the computer.
Ä 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.