Maintenance and Service Guide

Table Of Contents
6 Troubleshooting without diagnostics
This chapter provides information on how to identify and correct minor problems, such as USB devices, hard
drive, optical drive, graphics, audio, memory, and software problems. If you encounter problems with the
computer, see the tables in this chapter for probable causes and recommended solutions.
NOTE: For information on specic error messages that may appear on the screen during Power-On Self-Test
(POST) at startup, see POST error messages on page 100.
Safety and comfort
WARNING! Misuse of the computer or failure to establish a safe and comfortable work environment may
result in discomfort or serious injury. See the Safety & Comfort Guide at http://www.hp.com/ergo for more
information on choosing a workspace and creating a safe and comfortable work environment. For more
information, see the Safety & Regulatory Information guide.
Before you call for technical support
If you are having problems with the computer, try the appropriate solutions below to try to isolate the exact
problem before calling for technical support.
Run the HP diagnostic tool.
Run the hard drive self-test in Computer Setup. See Computer Setup (F10) Utility on page 59 for more
information.
Check the Power LED on the front of the computer to see if it is ashing red. The ashing lights are error
codes that will help you diagnose the problem. See POST error messages on page 100 for more
information.
If the screen is blank, plug the monitor into a dierent video port on the computer if one is available. Or,
replace the monitor with a monitor that you know is functioning properly.
If you are working on a network, plug another computer with a dierent cable into the network
connection. There might be a problem with the network plug or cable.
If you recently added new hardware, remove the hardware and see if the computer functions properly.
If you recently installed new software, uninstall the software and see if the computer functions properly.
Boot the computer to the Safe Mode to see if it will boot without all of the drivers loaded. When booting
the operating system, use “Last Known Conguration.”
See the comprehensive online technical support at http://www.hp.com/support.
See Helpful hints on page 73 in this guide.
To assist you in resolving problems online, HP Instant Support Professional Edition provides you with self-
solve diagnostics. If you need to contact HP support, use HP Instant Support Professional Edition's online chat
feature.
Access the Business Support Center (BSC) at http://www.hp.com/go/bizsupport for the latest online support
information, software and drivers, proactive notication, and worldwide community of peers and HP experts.
72 Chapter 6 Troubleshooting without diagnostics