Basic Pre-Boot Diagnostics; Pre-Boot Diagnostics Error Codes (Beep Codes) - HP Vectra VL800 Technical Reference Manual

7 Tests and Error Messages
Test Sequence and Error Messages

Basic Pre-boot Diagnostics

The first diagnostic test (called basic pre-boot diagnostics) is run to check
the presence of the processor or terminators, power supply, hardware
monitoring and thermal sensors. Simply having a power cord connected to
the PC activates the Basic Pre-boot Diagnostics.
The pre-boot diagnostic tests are run in order of priority with respect to
their importance to computer functions.
The following diagram shows how the Pre-boot Diagnostics works when it
encounters an error.

Pre-boot Diagnostics Error Codes (Beep Codes)

When a failure occurs prior to operating system loading, the PC emits a
distinctive modulated sound (repeated three times), followed by a series of
beeps. These beeps identify the part that needs troubleshooting or
replacement.
Number
of beeps
1 Absent or incorrectly connected processor
2 Power supply is in protected mode
3 Memory modules not present, incompatible or not functioning
4 Video controller failure
5 PnP/PCI initialization failure
6 Corrupted BIOS. You need to activate crisis recovery procedure
7 System board failure
124
Problem