Diagnosis Guidelines; Diagnosis At Startup; Diagnosis During Operation - HP Z1 Maintenance And Service Manual

Diagnosis guidelines

If you encounter a problem with the computer or software, the following sections provide a list of
general suggestions that help you isolate and focus on the problem before taking further action.

Diagnosis at startup

Verify that the computer and external monitor (if connected) are plugged into a functional AC
●
power outlet.
Remove all CDs or USB drive keys from your system before turning it on.
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Verify that the computer is turned on and the power light is blue (normal operation) and not red
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(error state).
If you have installed an operating system other than the factory-installed operating system,
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check to be sure that it is supported on your system by visiting
quickspecs.

Diagnosis during operation

Look for blinking LEDs on the side of the computer. The blinking lights are error codes that will
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help you diagnose the problem. Refer to the
on page 81
audible codes.
Check all cables for loose or incorrect connections.
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Wake the computer by pressing any key on the keyboard or the power button. If the system
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remains in suspend mode, shut down the system by pressing and holding the power button for
at least four seconds, and then press the power button again to restart the system. If the system
does not shut down, unplug the power cord, wait a few seconds, and then plug it in again. If it
does not restart, press the power button to start the computer.
Reconfigure the computer after installing a non–plug and play expansion board or other option.
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Be sure that all required device drivers have been installed. For example, if you have connected
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a printer, you must install a printer driver.
If you are working on a network, plug another computer with a different cable into the network
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connection. There might be a problem with the network plug or cable.
If you recently added new hardware, remove it and see if the computer functions properly.
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If you recently installed new software, uninstall it and see if the computer functions properly.
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Upgrade the BIOS. A new release of the BIOS might have been released that supports new
●
features or fixes your problem.
Press the
●
correctly.
section of this document for information on interpreting diagnostic lights and
Caps Lock key. If the Caps Lock
http://www.hp.com/go/
Diagnostic LED and audible (beep) codes
LED toggles on or off, the keyboard is operating
Diagnosis guidelines 55