8-4 www.hp.com Technical Reference Guide
SYSTEM BIOS
✎
Refer to Chapter 3, “Processor/Memory Subsystem” for the SPD format and DIMM data specific
to this system.
The BIOS performs memory detection and configuration with the following steps:
1. Program the buffer strength control registers based on SPD data and the DIMM slots that are
populated.
2. Determine the common CAS latency that can be supported by the DIMMs.
3. Determine the memory size for each DIMM and program the GMCH accordingly.
4. Enable refresh.
8.3.4 Boot Error Codes
The BIOS provides visual and audible indications of a failed system boot by using the system’s
power LED and the system board speaker. The error conditions are listed in the following table.
Table 8-1
Boot Error Codes
Visual (power LED) Audible (speaker) Meaning
Blinks red 2 times @ 1 Hz None Processor thermal shut down. Check air flow,
fan operation, and CPU heat sink.
Blinks red 3 times @ 1 Hz None Processor not installed. Install or reseat CPU.
Blinks red 4 times @ 1 Hz None Power failure (power supply is overloaded).
Check storage devices, expansion cards
and/or system board (CPU power connector
P3).
Blinks red 5 times @ 1 Hz 5 beeps Pre-video memory error. Incompatible or
incorrectly seated DIMM.
Blinks red 6 times @ 1 Hz 6 beeps Pre-video graphics error. On system with
integrated graphics, check/replace system
board. On system with graphics card,
check/replace graphics card.
Blinks red 7 times @ 1 Hz 7 beeps PCA failure. Check/replace system board.
Blinks red 8 times @ 1 Hz 8 beeps Invalid ROM (checksum error). Reflash ROM
using CD or replace system board.
Blinks red 9 times @ 1 Hz 9 beeps System powers on but fails to boot. Check
power supply, CPU, system board.
Blinks red 10 times @ 1 Hz None Bad option card.
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