IBM DS4800 User, Installation And Maintenance Manual page 183

Table 24. DS4800 Symptom-to-FRU index (continued)
Problem
indicator Component
All green LEDs All CRUs
off
Possible cause
Subsystem power is off
AC power failure
Both power supply-fans
have failed
Both controller circuit
breakers have tripped
Possible solutions
Check that all power cords are plugged in and all
power switches are on. If applicable, check that
the main circuit breakers for the rack cabinet are
turned on.
Check the main circuit breaker and ac outlet.
Replace the power supply-fans.
Reset the controller circuit breakers.
Chapter 6. Hardware maintenance
161