System Board Switches; Bios History; Pre-Boot Diagnostic Beep Codes - Compaq Evo D310 Service Handbook Chapter

system board switches

Switch
On Reserved
1-4
Off Reserved – Normal operation
On Clears CMOS and passwords
(to reload the Setup program defaults)
5
Off Normal operation
On Clears User and Administrator passwords
6
Off Normal operation
On BIOS recovery mode: forces booting in the BIOS boot
block area
7
Off Normal operation
On Not used
8
Off Not Used - Normal operation
On Normal operation (Software boot block protection)
9
Off Hardware boot block protection
On Not used
10
Off Not Used - Normal operation

BIOS history

For the latest BIOS, the flasher utility program, and the BIOS history connect to
http://www.hp.com/go/support/

pre-boot diagnostic beep codes

Number
of Beeps
0 If you hear the buzzing signal: system OK
No buzzing audio signal: no power, PC is unplugged, power supply is
down or system board has failed
1 Processor absent, not correctly connected or ZIF (Zero Insertion Force)
socket not closed
2 Power supply is in protected mode. This error does not necessarily
indicate a power supply error (e.g. short circuit on the sytem board).
3 No memory, bad memory modules, incompatible memory module
4 Graphics solution problem
5 PnP/PCI initialization problem
6 Corrupted BIOS. You need to activate crisis recovery procedure (refer to
release note provided with BIOS).
7 Defective system board
Compaq Evo D310 micro desktop pc
Function
Meaning
Compaq Evo D310 micro desktop pc 1-5
Default
Off
Off
1
Off
Off
Off
On
Off