Dell OptiPlex 7090 Micro Form Factor Service Manual page 60

The following table shows different light patterns and what they indicate:
Table 20. Diagnostic LED behavior
Blinking pattern
Amber
1 1
1 2
1 5
1 6
2 1
2 2
2 3
2 4
2 5
2 6
2 7
2 8
3 1
3 2
3 3
3 4
3 5
3 6
3 7
4 1
4 2
60 Troubleshooting
White
MBIST: TPM Detection Failure
MBIST:SPI flash, Unrecoverable SPI flash
failure
i-Fuse: Failure EC unable to program i-Fuse
EC internal: Failure Generic catch-all for
ungraceful EC code flow errors
Processor failure
System board: BIOS or ROM (Read-Only
Memory) failure
No memory or RAM (Random-Access
Memory) detected
Memory or RAM (Random-Access Memory)
failure
Invalid memory installed
System-board or chipset error
Display failure
LCD power rail failure
CMOS battery failure
PCI, video card/chip failure
Recovery image not found
Recovery image found but invalid
Power-rail failure
System BIOS Flash incomplete
Management Engine (ME) error
Memory DIMM power rail failure
CPU power cable connection issue
Problem description Suggested resolution
Replace the system board.
Replace the system board.
Replace the system board.
Disconnect all power source (AC,
battery, coin-cell) and press and hold
the power button to drain flea power.
Run the Intel CPU diagnostics tools. If
problem continues, replace the system
board.
Flash the latest BIOS version. If problem
continues, replace the system board.
Check and confirm that the memory
module is installed properly. If problem
continues, replace the memory module.
Reset the memory module. If problem
continues, replace the memory module.
Reset the memory module. If problem
continues, replace the memory module.
Flash the latest BIOS version. If problem
continues, replace the system board.
Flash the latest BIOS version. If problem
continues, replace the LCD module.
Replace the system board.
Reset the CMOS battery connection.
If problem continues, replace the RTS
battery.
Replace the system board.
Flash the latest BIOS version. If problem
continues, replace the system board.
Flash the latest BIOS version. If problem
continues, replace the system board.
EC ran into power sequencing failure. If
problem continues, replace the system
board.
Flash corruption detected by BIOS. If
problem continues, replace the system
board.
Timeout error displayed while waiting on
ME to reply to HECI message. If problem
continues, replace the system board.
Replace the system board.
Initiate PSU BIST. If problem persists,
replace the system board.