HP 6600 User Manual page 9

CAUTION:
When the status LED is red, check whether the power module has
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encountered the following failures: output short circuit, output
over-current, output over-voltage, or overheat. If you have
detected and removed the output short circuit, output over-current,
or overheat failures, the power module automatically restores.
However, if the power module encounters the output over-voltage
failures, the power module will enter the deadlock sate, and
cannot automatically restore after you remove the failures. To
restore the power module in the deadlock state, turn off the power
switch, unplug the power cord, plug the power cord, and then
turn on the power switch.
Do not frequently turn on and turn off the power module. The
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interval between each turning on and turn off operation should
be longer than 30 seconds.
After the circuit breaker that connects to a power module is off, it
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is normal that the LEDs on the power module last on for a while.
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