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20 About Your System
• Always attach an external device while your system and the device are
turned off. Next, turn on any external devices before turning on the system
(unless the documentation for the device specifies otherwise).
See "Using the System Setup Program" on page 46 for information about
enabling, disabling, and configuring I/O ports and connectors.
Power Indicator Codes
The power button on the front panel controls the power to the system from
the system's power supplies. The power indicator lights green when the
system is on.
The indicators on the redundant power supplies show whether power is
present or whether a power fault has occurred (see Figure 1-4). Table 1-4 lists
the power supply indicator codes.
Table 1-4. Redundant Power Supply Indicators
Indicator Function
Power supply status Green indicates that the power supply is operational and
providing DC power to the system.
Power supply fault Amber indicates a problem with the power supply.
AC line status Green indicates that a valid AC source is connected to the
power supply and is operational.