HP Pro 3420

Hard Drive Cables and Connector ..................................................................................................... 64
Speakers ............................................................................................................................................ 66
System Board ..................................................................................................................................... 68
Front Bezel ......................................................................................................................................... 69
Display Panel ..................................................................................................................................... 70
Appendix A Troubleshooting Without Diagnostics ...................................................................................... 74
Safety and Comfort ............................................................................................................................ 74
Before You Call for Technical Support ............................................................................................... 74
Helpful Hints ....................................................................................................................................... 75
Solving General Problems .................................................................................................................. 77
Solving Power Problems .................................................................................................................... 80
Solving Diskette Problems ................................................................................................................. 81
Solving Hard Drive Problems ............................................................................................................. 84
Solving Media Card Reader Problems ............................................................................................... 87
Solving Display Problems ................................................................................................................... 89
Solving Audio Problems ..................................................................................................................... 93
Solving Printer Problems .................................................................................................................... 95
Solving Keyboard and Mouse Problems ............................................................................................ 96
Solving Hardware Installation Problems ............................................................................................. 98
Solving Network Problems ................................................................................................................. 99
Solving Memory Problems ............................................................................................................... 103
Solving Processor Problems ............................................................................................................ 104
Solving CD-ROM and DVD Problems .............................................................................................. 105
Solving USB Flash Drive Problems .................................................................................................. 107
Solving Front Panel Component Problems ...................................................................................... 108
Solving Internet Access Problems .................................................................................................... 108
Solving Software Problems .............................................................................................................. 111
Contacting Customer Support .......................................................................................................... 112
Appendix B POST Error Messages .............................................................................................................. 113
POST Numeric Codes and Text Messages ..................................................................................... 114
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes .............................................. 121
Appendix C Connector Pin Assignments .................................................................................................... 124
Ethernet BNC ................................................................................................................................... 124
USB .................................................................................................................................................. 124
Microphone ....................................................................................................................................... 124
Headphone ....................................................................................................................................... 125
Line-in Audio .................................................................................................................................... 125
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