About Your System 15Power Supply IndicatorsThe voltage selection switch on the back panel of the system allows you to select one of two primaryvoltage 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 StartedGuide.Diagnostic LightsThe 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 circleindicates 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 SwitchIf your power source is: The voltage selection switch should be set to:110 V220 V115230Table 1-5. Diagnostic Indicator CodesCode Causes Corrective ActionThe computer is in anormal off condition or apossible pre-BIOS failurehas occurred.The diagnostic lights arenot lit after the systemsuccessfully boots to theoperating system.Plug the computer into a working electricaloutlet and press the power button.Possible processor failure. See "Troubleshooting the Microprocessor" onpage 95.Memory failure. See "Troubleshooting System Memory" onpage 87.Possible expansion cardfailure.See "Troubleshooting Expansion Cards" onpage 93.book.book Page 15 Tuesday, August 25, 2009 1:14 PM
