HP Net Vectra Technical Reference Manual page 31

Do not switch off the computer until the system BIOS update procedure has
completed, successfully or not. To do so could cause irrecoverable damage
to the ROM, thereby requiring the replacement of the system board. The
control panel switches are automatically disabled to prevent accidental
interruption of the flash programming process, but this, of course, does not
protect against deliberate or inadvertent removal of the power cord, or
other types of power failure, however caused.
If the flashing process goes wrong, isolate the PC from external connections,
remove the cover, and connect an external flexible disk drive to the FDD
connector on the system board. Insert a system diskette containing the new
BIOS and its associated files. Close the "clear password" and "clear CMOS"
switches (SW-7 and SW-8) on the system board, reconnect the PC and turn
it on. This forces the PC to re-boot from the flexible disk drive. Once the
recovery program has completed, the BIOS can be flashed by running the
program. Once completed, return the system board switches to
PHLASH.EXE
their original positions, and disconnect the flexible disk drive.
System Board Switches
Five of the system board switches (whose location is shown on page 16) set
the working frequencies for the computer, as summarized on page 24. The
others set the configuration for the computer, as summarized in the
following table.
Switch
1-5 - Bus frequencies (see the table on page 24)
6 Open Not used
Open Normal operation
7
Closed Clears User and Administrator passwords
Open Normal operation
8
Closed Clears CMOS (to reload the Setup program defaults)
Open Disables keyboard power-on
9
Closed Normal operation
Open Normal operation
10
Closed Clears product identification field
Function
2 System Board
Devices on the ISA Bus
Default
-
Open
Open
Open
Closed
Open
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