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About Your System 15
Power Supply Indicators
The voltage selection switch on the back panel of the system allows you to select one of two primary
voltage inputs. Ensure that the switch is set to the proper voltage according to Table 1-4.
For information on system power requirements, see "Technical Specifications" in your Getting Started
Guide.
Diagnostic Lights
The four diagnostic indicator lights on the system front panel display error codes during system startup.
Table 1-5 lists the causes and possible corrective actions associated with these codes. A highlighted circle
indicates the light is on; a non-highlighted circle indicates the light is off.
NOTE: Once the system completes POST, all diagnostic lights will be OFF.
Table 1-4. Voltage Selection Switch
If your power source is: The voltage selection switch should be set to:
110 V
220 V
115
230
Table 1-5. Diagnostic Indicator Codes
Code Causes Corrective Action
The computer is in a
normal off condition or a
possible pre-BIOS failure
has occurred.
The diagnostic lights are
not lit after the system
successfully boots to the
operating system.
Plug the computer into a working electrical
outlet and press the power button.
Possible processor failure. See "Troubleshooting the Microprocessor" on
page 95.
Memory failure. See "Troubleshooting System Memory" on
page 87.
Possible expansion card
failure.
See "Troubleshooting Expansion Cards" on
page 93.
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