HP ProDesk 680 G4 PCI MT Maintenance And Service Manual page 7

Solving USB flash drive problems ........................................................................................................................................ 87
Solving front panel component problems ......................................................................................................................... 88
Solving Internet access problems ....................................................................................................................................... 88
Solving software problems .................................................................................................................................................. 89
7 POST error messages and diagnostic front panel LEDs and audible codes ................................................................................. 90
POST numeric codes and text messages ........................................................................................................................... 90
Interpreting system validation diagnostic front panel LEDs and audible codes .......................................................... 95
8 Password security and resetting CMOS .............................................................................................................................................. 97
Resetting CMOS and/or the password jumper .................................................................................................................. 98
Changing a Setup or Power-on password ....................................................................................................................... 100
Deleting a Setup or Power-on password ......................................................................................................................... 100
9 Using HP PC Hardware Diagnostics (UEFI) ....................................................................................................................................... 101
Downloading HP PC Hardware Diagnostics (UEFI) to a USB device ............................................................................. 102
10 System backup and recovery ........................................................................................................................................................... 103
Backing up, restoring, and recovering .............................................................................................................................. 103
Creating recovery media and backups ........................................................................................................ 103
Using Windows tools ...................................................................................................................................... 105
Restore and recovery ..................................................................................................................................... 105
Appendix A Battery replacement .......................................................................................................................................................... 108
Appendix B Statement of memory volatility ....................................................................................................................................... 111
Current BIOS steps ............................................................................................................................................................... 111
Nonvolatile memory usage ................................................................................................................................................ 113
Questions and answers ...................................................................................................................................................... 115
Using HP Sure Start ............................................................................................................................................................. 116
Appendix C Power cord set requirements ........................................................................................................................................... 117
General requirements ......................................................................................................................................................... 117
Creating HP Recovery media (select products only) ............................................................. 104
Recovering using HP Recovery Manager ................................................................................ 106
What you need to know before you get started ............................................... 106
Using the HP Recovery partition (select products only) .................................. 106
Using HP Recovery media to recover .................................................................. 107
Changing the computer boot order .................................................................... 107
Removing the HP Recovery partition (select products only) .......................... 107
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