Solving Minor Problems - HP xw4000 Service & Reference Manual

Troubleshooting Without Diagnostics

Solving Minor Problems

Problem
Computer will not turn on.
Computer appears locked up and
won't turn off when the power button is
pressed.
Computer date and time display is
incorrect.
Computer powered off automatically.
Insufficient power to the components.
Computer appears to pause
periodically
Cannot remove computer cover or side
panel.
Computer does not boot up and power
and hard drive LEDs are blinking.
F–2
Possible Solution
1. Ensure that the computer is properly connected to an
external power source and the wall outlet is active.
2. A PCI or ISA card that has been installed is defective.
Remove any expansion card that was just installed.
3. Reseat drive power, data, and power supply cables.
4. Disconnect all drive cables and reboot. Add devices
back one at a time to isolate problem.
Software control of the power button may not be functional.
Press and hold the button for four seconds, then release. This
invokes the hardware override for the power button.
First, reset the date and time under Control Panel. If the
problem persists, the real-time clock (RTC) battery may need
to be replaced. Refer to Section 9.1 in this guide. When
booting from a network, the PC clock may be reset to that of
the server. The PC clock may also change when using other
services through the server.
1. The unit temperature was exceeded because the unit is
in an exceedingly hot environment or the fan is blocked.
Let the unit cool down.
2. The fan may not be functioning correctly or the air vents
are blocked.
3. The unit temperature was exceeded because the
computer was functioning with the cover or side panel
removed. Replace cover or side panel, and let the
computer cool down.
4. The unit temperature was exceeded because the air
baffle is not properly installed to direct air flow over the
processor.
Ensure that both power supply cables are connected to the
system board (on some workstations).
Network driver is loaded and no network connection is
established. Establish a network connection, or use
Computer Setup or Windows Device Manager to disable
the network controller.
1. Smart Lock, featured on some computers, is locked.
Unlock the Smart Cover Lock using Computer Setup.
2. The Smart Cover FailSafe Key, a device for manually
disabling the Smart Cover Lock, is available from
Compaq. You need the FailSafe Key in cases of
forgotten password, power loss, or computer
malfunction.
Ensure that the riser board is properly seated.
Service Reference Guide