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OptiPlex 3090 Small Form Factor Service Manual

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Diagnostics

The computer POST (Power On Self-Test) ensures that it meets the basic system requirements and the hardware is working appropriately before the boot process begins. If the system passes the POST, the system continues to start in a normal mode. However, if the system fails the POST, the system 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 Notes
Off Off S4, S5

  • Hibernate or Suspend to Disk (S4)

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

The 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 system is receiving electrical power, and power supplied by the power supply is normal. A device might be malfunctioning or incorrectly installed. Refer to 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. Diagnostic LED behaviorThe following table provides the diagnostically led behavior:
Blinking pattern Problem description
Amber White
1 2 Unrecoverable SPI Flash Failure
2 1 CPU failure
2 2 System board failure (included BIOS corruption or ROM error)
2 3 No memory/RAM detected
2 4 Memory/RAM failure
2 5 Invalid memory installed
2 6 System board/Chipset Error/Clock failure/Gate A20 failure/Super I/O failure/Keyboard controller failure
3 1 CMOS battery failure
3 2 PCI or Video card/chip failure
3 3 BIOS Recovery image not found
3 4 BIOS Recovery image found but invalid
3 5 Power rail failure
3 6 SBIOS Flash corruption
3 7 Intel ME (Management Engine) Error
4 2 CPU Power Cable Connection Issue

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