Table 21 describes what happens when the server is at UEFI, and you press the power button.
Table 21 Server power button functions when server is on and at UEFI
ReactionAction
System power turns off immediately (hard power off)1-3 seconds
System power turns off immediately (hard power off)5 seconds or longer
Table 22 describes what happens when the server is on with the operating system running, and
you press the power button.
Table 22 Server power button functions when server is on and OS is running
ReactionAction
System power turns off (software-controlled power off)1-3 seconds
System power turns off immediately (hard power off)5 seconds or longer
If the server is off, and power is not connected to the server power supplies, pressing the power
button has no effect.
If the server is off, and power is connected to server power supplies, the front panel power LED
flashes at a 1 Hz rate. In this state, standby power is available to server circuits, but main power
is off. Table 23 describes what happens when the server is off, and you press the power button.
Table 23 Server power button functions when server is off
ReactionAction
System power turns on1-3 seconds
Server does not power on
The server power button on the front panel operates differently depending on how long the button
is pressed, and on what the system is doing when the button is pressed. You must be aware of its
uses to properly troubleshoot the system.
NOTE: If the server is off, and power is not connected to server power supplies, pressing the
power button has no effect.
Power problems during installation are usually related to the installation process. If the server does
not power on, view the LED indicators on the power supply rear panels and perform the following:
• If the ac power LED on the power supply on the rear panel of the server is lit, power is available
to the server.
• If the ac power LED is not lit, the server is either in standby power mode, or there is a problem.
Re-seat the power supply. If the problem persists, remove and re-seat the board within the
server. If the problem persists, replace the power supply or the power supply interface board.
UEFI menu is not available
If you cannot access the UEFI from either the main disk partition or the CD, use the following tools
to solve the problem:
• Front panel LEDs
• iLO 3 MP
Console messages◦
◦ SEL
58 Installing the server
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