SYSTEM BIOS

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.

8.3.4Boot 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

2 beeps

Processor thermal shut down. Check air flow, fan

 

 

operation, and CPU heat sink.

 

 

 

Blinks red 3 times @ 1 Hz

3 beeps

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

10 beeps

Bad option card.

NOTE: Audible indications occur only for the five cycles of the error indication. Visual indications occur indefinitely until power is removed or until error is corrected.

 

8-4

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Technical Reference Guide