HP A3550A - High Availability Disk Arrays Model 20 Storage Enclosure User Manual page 284

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Condition/Symptom
Power-up tests fail.
No FRU LEDs on and fans not running Indicates no AC power is being delivered to the array's
Solution
Inserting a CRU while the power-up tests are running can
cause the tests to fail. Insert all CRUs and cycle power to
rerun the power-up tests.
power supply(s). Check input AC power. If AC power is
present, remove array power supply(s) and check for AC
power at the internal AC power supply plug.
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