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G5 5090 Service Manual

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Diagnostics

The computer POST (Power On Self-Test) ensures that it meets the basic computer requirements and the hardware is working appropriately before the boot process begins. If the computer passes the POST, the computer continues to start in a normal mode. However, if the computer fails the POST, the computer emits a series of LED codes during the start-up. The system LED is integrated on the Power button.

The following table shows different light patterns and what they indicate.

Table 1. Power LED summary The following table provides the power led summary and what they indicate.
Amber LED state White LED state System state Description
Off Off S4, S5

  • Hibernate or Suspend to Disk (S4)

  • Power is off (S5)
Off Blinking S1, S3

System is in a low-power state, either S1 or S3. This does not indicate a fault condition.

Previous State Previous State S3, no PWRGD_PS This entry provides for the possibility of a delay from SLP_S3# active to PWRGD_PS inactive.
Blinking Off S0, no PWRGD_PS

Boot Failure - The computer is receiving electrical power, and power supplied by the power supply is normal. A device might be malfunctioning or incorrectly installed. See the table below for Amber Blinking Pattern diagnostics suggestion and possible failures.

Steady Off S0, no PWRGD_PS, Code fetch = 0

Boot Failure - This is a system fault error condition, including the power supply. Only the +5VSB rail on the power supply is working correctly.

Off Steady S0, no PWRGD_PS, Code fetch = 1 This indicates that the host BIOS has started to execute and the LED register is now writable.
Table 2. Amber LED blinking failuresThe following table provides the amber led blinking and what they indicate.
Amber LED state White LED state System state
2 1 System board failure
2 2 System board, power-supply unit, or cabling failure
2 3 System board, memory, or processor failure
Table 3. States Under Host BIOS Control The following table provides the different light patterns and what they indicate.
Amber LED state White LED state System state Description
2 5 BIOS state 1 BIOS Post code (Old LED pattern 0001) Corrupt BIOS
2 6 BIOS state 2 BIOS Post code (Old LED pattern 0010) Processor configuration error or processor failure
2 7 BIOS state 3 BIOS Post code (Old LED pattern 0011) Memory failure
3 1 BIOS state 4 BIOS Post code (Old LED pattern 0100) PCI or video card or chip failure.
3 3 BIOS state 6 BIOS Post code (Old LED pattern 1000) No memory detected.
3 5 BIOS state 8 BIOS Post code (Old LED pattern 1010) Memory configuration error.
3 6 BIOS state 9 BIOS Post code (Old LED pattern 1011) BIOS recovery image not found.
3 7 BIOS state 10 BIOS Post code (Old LED pattern 1110) BIOS recovery image found but invalid.

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