HP dx7510 Service Reference Guide: HP Compaq dx7510/dx7518 Business PC - Page 96

Solving General Problems

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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. Computer will not turn on. Cause Solution 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 rear of computer chassis (some Select the proper AC voltage using the selector switch. models) not switched to correct line voltage (115V or 230V). 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. 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 System has locked up. Keyboard or mouse is not connected to computer. Computer is in standby mode. Solution Restart computer. Connect keyboard and mouse cables to computer. 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. 88 Appendix C Troubleshooting

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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.
Computer will not turn on.
Cause
Solution
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 rear of computer chassis (some
models) not switched to correct line voltage (115V or 230V).
Select the proper AC voltage using the selector 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.
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
System has locked up.
Restart computer.
Keyboard or mouse is not connected to computer.
Connect keyboard and mouse cables to computer.
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.
88
Appendix C
Troubleshooting