HP ProOne 400 G4 20-inch Non-Touch All-in-One Business PC User Manual Page 86
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7 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, refer to the tables in this chapter for probable causes and recommended solutions.
NOTE: For information on specic error messages that may appear on the screen during Power-On Self-Test
(POST) at startup, refer to POST error messages and diagnostic front panel LEDs and audible codes
on page 102.
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. Refer to 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, refer to 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. Refer to 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. Refer to POST error messages and diagnostic front panel
LEDs and audible codes on page 102 for more information.
●
If you are working on a network, plug another computer with a dierent cable into the network
connection. There may 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 Conguration.”
●
Refer to the comprehensive online technical support at http://www.hp.com/support.
●
Refer to Helpful hints on page 79 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 HP Instant Support Professional Edition at: http://www.hp.com/go/ispe.
Access the Business Support Center (BSC) at http://www.hp.com/go/bizsupport for the latest online support
information, software and drivers, proactive notication, and worldwide community of peers and HP experts.
If it becomes necessary to call for technical assistance, be prepared to do the following to ensure that your
service call is handled properly:
78 Chapter 7 Troubleshooting without diagnostics
- About This Book 3
- Table of contents 5
- 1 Product features 9
- Front components 10
- Side components 10
- Rear components 11
- Bottom components 11
- Component 14
- (1) Serial number 14
- (2) Product number 14
- (3) Warranty period 14
- Labels 7 15
- 2 Illustrated parts catalog 16
- System parts 9 17
- Mass storage devices 19
- Processors and memory modules 20
- Keyboards and mice 20
- Keyboards and mice 13 21
- Generating static 22
- Grounding the work area 23
- Operating guidelines 24
- Routine care 25
- Service considerations 26
- Hard Drives 27
- Lithium coin cell battery 27
- SATA hard drive cables 28
- Cable management 28
- VESA bracket 30
- Rear port cover 31
- Hard drive 32
- Hard drive 25 33
- Optical drive 34
- Optical drive 27 35
- M.2 solid-state drive 36
- WLAN module 40
- Option board 41
- Hood sensor 42
- Fan assembly 43
- Heat sink 44
- Processor 46
- System board 47
- System board callouts 49
- Speakers 50
- 20-models 51
- Power button board 53
- 23.8-inch models 62
- (1) Microphone modules 63
- Webcam 55 63
- 20-inch models 65
- Antennas in 23.8-inch models 66
- Computer Setup–Main 69
- Computer Setup—Security 71
- Computer Setup—Advanced 75
- Safety and comfort 86
- Helpful hints 87
- Solving general problems 88
- Solving general problems 81 89
- Solving power problems 91
- Solving hard drive problems 92
- Solving audio problems 94
- Solving printer problems 95
- Solving network problems 98
- Solving network problems 91 99
- Solving memory problems 100
- Solving memory problems 93 101
- Solving software problems 103
- Using Windows tools 105
- Before you begin 106
- Creating the recovery media 106
- Restoring and recovery 107
- Resetting the password jumper 117
- A Power cord set requirements 120
- Country-specic requirements 121
- Nonvolatile memory usage 124
- Nonvolatile memory usage 117 125
- Questions and answers 126
- C Specications 128
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