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Precision 3440 Small Form Factor 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. Diagnostic LED behaviorThe following table provides the diagnostically led behavior:
Blinking pattern Problem description Suggested resolution
Amber White
1 2 Unrecoverable SPI Flash Failure
2 1 CPU failure
  • Run the Dell Support Assist/Dell Diagnostics tool.
  • If problem persists, replace the system board.
2 2 System board failure (included BIOS corruption or ROM error)
  • Flash latest BIOS version
  • If problem persists, replace the system board.
2 3 No memory/RAM detected
  • Confirm that the memory module is installed properly.
  • If problem persists, replace the memory module.
2 4 Memory/RAM failure
  • Reset the memory module.
  • If problem persists, replace the memory module.
2 5 Invalid memory installed
  • Reset the memory module.
  • If problem persists, replace the memory module.
2 6 System board / Chipset Error / Clock failure / Gate A20 failure / Super I/O failure / Keyboard controller failure
  • Flash latest BIOS version
  • If problem persists, replace the system board.
3 1 CMOS battery failure
  • Reset the CMOS battery connection.
  • If problem persists, replace the RTS battery.
3 2 PCI or Video card/chip failure

Replace the system board.

3 3 BIOS Recovery image not found
  • Flash latest BIOS version
  • If problem persists, replace the system board.
3 4 BIOS Recovery image found but invalid
  • Flash latest BIOS version
  • If problem persists, replace the system board.
3 5 Power rail failure
  • EC ran into power sequencing failure.
  • If problem persists, replace the system board.
3 6 SBIOS Flash corruption
  • Flash corruption detected by SBIOS
  • If problem persists, replace the system board.
3 7 Intel ME (Management Engine) Error
  • Timeout waiting on ME to reply to HECI message
  • If problem persists, replace the system board.
4 2 CPU Power Cable Connection Issue

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