Inspiron 3891 Service Manual

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System diagnostic lights

Power-supply diagnostics light

Indicates the power-supply state.

Hard-drive activity light

Turns on when the computer reads from or writes to the hard drive.

Table 1. LED codesLED light codes for component issues/failure in the product.
Diagnostic light codes	Problem description
1,1	TPM detection failure
1,2	Unrecoverable SPI flash failure
2,1	CPU failure
2,2	Motherboard, covers BIOS corruption or ROM error
2,3	No Memory/RAM detected
2,4	Memory/RAM failure
2,5	Invalid memory installed
2,6	Motherboard/chipset error
3,1	CMOS battery failure
3,2	PCI of Video card/chip failure
3,3	Recovery Image not found
3,4	Recovery Image found but invalid
3,5	EC ran into power sequencing failure
3,6	Flash corruption detected by SBIOS
3,7	Timeout waiting on ME to reply to HECI message
4,1	Memory DIMM power rail failure
4,2	CPU power cable connection issue

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