134
Rev. 8.0
A26361-K863-Z102-8-7619
System Power LED Remains Dark
Troubleshooting and Tips
13.2
System Power LED Remains Dark
The power LED (see figure 15 on page 42) remains dark after you have
switched ON your system:
Wrongly Connected Power Cables
Ê
Make sure that the power cables are correctly connected to the system
power supply units and to the mains socket strip of the rack (see section
“Connecting the System to the Line Voltage” on page 40).
Power Supply Overloaded
Ê
Unplug the power cables from the insulated sockets of the power supply
units.
Ê
Wait a few seconds and plug the power plugs into the insulated sockets
again.
Ê
Switch ON your system.
13.3
Front or Rear Identify/Fault LED Blinks
Amber
If the front or rear identify/fault indicator blinks amber (see section “System
Operating and Indicator Elements” on page 42) one of the malfunctions
described below may have occurred in the system:
One of the Power Supply Units Fails
The PSU status LED is dark and/or the PSU fan failure LED blinks green if there
is an error in the corresponding power supply unit e.g. (see also “Power supply
unit: LEDs” on page 118):
–
general failure (alert or Fan #1 shutdown)
–
over temperature (any of the fans are not working properly in the corre-
sponding unit)
–
over current
–
over or under voltage
–
the PSU is reaching its end of life or is operating in an environment
exceeding the specified limits.
Ê
Check the PSU status and/or fan failure LEDs to identify the defective unit
and exchange it (see section “Replacing a Power Supply Unit” on page 119).
