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OptiPlex 7490 All-In-One Service Manual

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Diagnostics

Power status indicator light: Indicates the power status.

Solid amber—The system is unable to boot to the operating system. This indicates that the power supply or another device in the system is failing.

Blinking white—The system is unable to boot to the operating system. This indicates that the power supply is normal but another device in the system is failing or not installed properly.

NOTE See the light patterns to determine if the device that is failing.

Off—System is in hibernation or turned off.

The power status indicator blinks amber along with beep codes indicating failures.

For example, the power status indicator blinks amber two times followed by a pause, and then blinks white three times followed by a pause. This 2,3 pattern continues until the system is turned off indicating the Recovery image is not found.

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

Table 1. Diagnostic LED behaviorThe following table provides the system diagnostic LED pattern:
Blinking pattern Problem description Suggested resolution
Amber White
1 1 MBIST: TPM Detection Failure Replace the system board.
1 2 MBIST:SPI flash, Unrecoverable SPI flash failure Replace the system board.
1 5 i-Fuse: Failure EC unable to program i-Fuse Replace the system board.
1 6 EC internal: Failure Generic catch-all for ungraceful EC code flow errors Disconnect all power source (AC, battery, coin-cell) and press and hold the power button to drain flea power.
2 1 Processor failure Run the Intel CPU diagnostics tools. If problem continues, replace the system board.
2 2 System board: BIOS or ROM (Read-Only Memory) failure Flash the latest BIOS version. If problem continues, replace the system board.
2 3 No memory or RAM (Random-Access Memory) detected Check and confirm that the memory module is installed properly. If problem continues, replace the memory module.
2 4 Memory or RAM (Random-Access Memory) failure Reset the memory module. If problem continues, replace the memory module.
2 5 Invalid memory installed Reset the memory module. If problem continues, replace the memory module.
2 6 System-board or chipset error Flash the latest BIOS version. If problem continues, replace the system board.
2 7 Display failure Flash the latest BIOS version. If problem continues, replace the LCD module.
2 8 LCD power rail failure Replace the system board.
3 1 CMOS battery failure Reset the CMOS battery connection. If problem continues, replace the RTS battery.
3 2 PCI, video card/chip failure Replace the system board.
3 3 Recovery image not found Flash the latest BIOS version. If problem continues, replace the system board.
3 4 Recovery image found but invalid Flash the latest BIOS version. If problem continues, replace the system board.
3 5 Power-rail failure EC ran into power sequencing failure. If problem continues, replace the system board.
3 6 System BIOS Flash incomplete Flash corruption detected by BIOS. If problem continues, replace the system board.
3 7 Management Engine (ME) error Timeout error displayed while waiting on ME to reply to HECI message. If problem continues, replace the system board.
4 1 Memory DIMM power rail failure Replace the system board.
4 2 CPU power cable connection issue Initiate PSU BIST. If problem persists, replace the system board.

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