HP 425 - Notebook PC Specifications Page 104
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Troubleshooting and Maintenance
Troubleshooting Your Computer
104 Reference Guide
If one or more display pixels look bad
TFT display manufacturing is a highly precise but imperfect technology, and
manufacturers cannot produce displays that are cosmetically perfect. Most, if not all, TFT
displays exhibit some level of cosmetic imperfection. These cosmetic imperfections may
be visible under varying display conditions, and can appear as bright, dim, or dark spots.
This issue is common across all vendors supplying TFT displays in their products and is
not specific to the HP notebook display.
HP notebook TFT displays meet or exceed all HP standards for cosmetic quality of TFT
displays. HP does not warrant that the displays will be free of cosmetic imperfections.
TFT displays can have a small number of cosmetic imperfections and still conform to
HP’s cosmetic quality specifications, including the following:
• No more than 6 pixels remain on (always one color, such as white, red, green, or blue
dots).
• No more than 6 pixels remain off (always dark).
• No more than a total of 8 pixels stuck on or off.
• No other stuck pixel within 15 mm of a stuck pixel.
Contact HP Customer Care if you have a display quality problem and require a more
comprehensive explanation of HP display quality—see “To contact HP for support or
service” on page 136. We expect that over time the industry will continue to produce
displays with fewer inherent cosmetic imperfections, and we will adjust our HP
guidelines as these improvements are implemented.
Docking Problems
If a port on a dock isn’t working
• Check that AC power is connected to the dock.
• Try using the corresponding port on the computer while undocked.
• Make sure the computer is fully inserted into the dock.
• See the manual for the dock.
If the operating system hangs when you dock or undock
• Your system may hang if you dock or undock your computer while you are
suspending or resuming. Make sure your computer has completely suspended or
resumed before you dock or undock it.
- Important Safety Information 3
- Edition History 5
- Contents 7
- Reference Guide 11 11
- Taking Inventory 12
- To buy accessories 13
- To find more information 14
- Front View 15
- Back View 16
- Bottom View 17
- Status Lights 18
- Setting Up Your Computer 20
- Step 2: Connect AC power 22
- Step 3: Connect a phone line 23
- Step 4: Turn on the computer 24
- Step 5: Set up Windows 24
- What to do next 26
- To connect to the Internet 26
- Basic Operation 27
- Operating Your Computer 28
- To reset the computer 29
- To change the boot device 30
- To use the pointing devices 30
- To use the Fn hot keys 32
- To use the One-Touch buttons 33
- To use the embedded keypad 34
- To use the ALT GR key 35
- To adjust the display 35
- To adjust the volume 36
- To work with CDs and DVDs 38
- Securing Your Computer 39
- To attach a security cable 40
- To protect against viruses 41
- To set PC identification 41
- To lock the hard disk drive 42
- WARNING 43
- Taking Care of Your Computer 45
- To safeguard your data 46
- To clean your computer 47
- Reference Guide 49 49
- Managing Power Consumption 50
- To manage power manually 53
- Using Battery Power 54
- To recharge the battery 55
- To use additional batteries 55
- To maximize processor speed 57
- Reference Guide 59 59
- Using the Modem 60
- To dial in to a network 63
- To send and receive e-mail 64
- Connecting to a LAN 68
- Making Wireless Connections 69
- Important 72
- Add-On Devices 75
- Using Plug-In Modules 76
- To play DVD movies 80
- To create or copy CDs 80
- Connecting PC Cards 81
- Connecting External Devices 83
- To connect a USB device 85
- To connect an audio device 85
- To use an external monitor 86
- To use a TV set as a monitor 88
- To connect a serial device 88
- To use a docking product 90
- Installing Additional RAM 93
- Reference Guide 99 99
- Audio Problems 100
- CD-ROM and DVD Problems 101
- Display Problems 103
- Docking Problems 104
- Hard Disk Drive Problems 105
- Heat Problems 106
- Infrared Problems 106
- LAN problems 109
- Memory Problems 110
- Modem Problems 110
- PC Card (PCMCIA) Problems 113
- Performance Problems 114
- Power and Battery Problems 115
- Printing Problems 118
- Startup Problems 120
- Wireless Problems 121
- Testing the Hardware 123
- Configuring the Computer 125
- 126 Reference Guide 126
- Main Menu 126
- Configuring the Computer 127
- Reference Guide 127 127
- System Devices Menu 127
- 128 Reference Guide 128
- Security Menu 128
- To set up TopTools 131
- CAUTION 132
- To update the BIOS 134
- To update Windows drivers 134
- HP Support and Service 135
- To get help from the web 136
- To receive repair service 139
- Reference Information 143
- Hardware Specifications 144
- Reference Information 145
- Hardware Specifications 145
- Reference Guide 145 145
- 146 Reference Guide 146
- Modem Reference Information 147
- 148 Reference Guide 148
- Reference Guide 149 149
- 150 Reference Guide 150
- Reference Guide 151 151
- 152 Reference Guide 152
- S-Registers (Ambit) 152
- Reference Guide 153 153
- Reference Guide 155 155
- 156 Reference Guide 156
- Reference Guide 157 157
- 158 Reference Guide 158
- Safety Information 159
- Ergonomics 160
- Battery Safety 160
- Laser Safety 161
- LED Safety 161
- Regulatory Information 163
- European Union 165
- Russia 167
- International 167
- 168 Reference Guide 168
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