UID button functionality  11 
Item  Description  Status 
1  Power On/Standby button and 
system power LED
1
• Solid green = System on
• Flashing green (1 Hz/cycle per sec) = Performing
power on sequence
• Solid amber = System in standby
• Off = No power present
2
2  Health LED
1 
• Solid green = Normal
• Flashing green (1 Hz/cycle per sec) = iLO is
rebooting
• Flashing amber = System degraded
• Flashing red (1 Hz/cycle per sec) = System critical
3
3  NIC status LED 
1 
• Solid green = Link to network
• Flashing green (1 Hz/cycle per sec) = Network
active
• Off = No network activity
4  UID button/LED
1
• Solid blue = Activated
• Flashing blue:
◦ 1 Hz/cycle per sec = Remote management or
firmware upgrade in progress
◦ 4 Hz/cycle per sec = iLO manual reboot
sequence initiated
◦ 8 Hz/cycle per sec = iLO manual reboot
sequence in progress
◦ Off = Deactivated
1 
When all four LEDs described in this table flash simultaneously, a power fault has occurred.
2 
Facility power is not present, the power cord is not attached, no power supplies are installed, power supply failure has
occurred, or the power button cable is disconnected. 
3 
If the health LED indicates a degraded or critical state, use iLO to review the system health status.
UID button functionality 
The UID button can be used to identify a specific server in a rack or display the Server Health Summary when 
the server will not power on. For more information, contact customer support. 
Front panel LED power fault codes 
The following table provides a list of power fault codes, and the subsystems that are affected. Not all power 
faults are used by all servers.