Table 9-2 summarizes LED codes for boards. The Power, Service, and Cycling symbols are marked on the card cage frame above the respective LEDs. Note that many but not all of the LED codes are the same as the system codes (Table 9-1).
Table 9-2 Board Status LED Codes
Power |
Service |
Cycling |
Condition |
---|---|---|---|
Off |
Off |
Off |
Board has no electrical power. |
Off |
On |
Off |
Board is in low-power mode, can be unplugged. |
Off |
Off |
Flashing |
Undefined. |
Off |
On |
Flashing |
Undefined. |
On |
Off |
Off |
System is hanging, either in POST/OBP or OS. |
On |
Off |
On |
Hung in OS. |
On |
On |
Off |
(Hung in POST/OBP) or (hung in OS and failed component on board). |
On |
On |
On |
(Hung in POST/OBP) or (hung in OS and failed component on board). |
On |
Off |
Flashing |
OS running. System is operating normally. |
On |
On |
Flashing |
OS running and failed component on board. |
On |
Flash |
Off |
Slow flash = POST. Fast flash = OBP. |
On |
Flash |
On |
OS or OBP error. |
For boards, Off-On-Off indicates that the board is in low-power mode and is ready for removal. (For the system, Off-On-Off indicates a failure.)
If the Power LED is lit, do not remove the board. Removing a board that is not in low-power mode will damage the board and the system.