Dell SC440 owner manual Diagnostic Lights, Power Supply Indicators

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.

Table 1-4. Voltage Selection Switch

If your power source is: The voltage selection switch should be set to:

110 V	115
220 V	230

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 1-5. Diagnostic Indicator Codes

Code	Causes	Corrective Action
	The computer is in a	Plug the computer into a working electrical
	normal off condition or a	outlet and press the power button.
	possible pre-BIOS failure
	has occurred.
	The diagnostic lights are
	not lit after the system
	successfully boots to the
	operating system.
	Possible processor failure. See "Troubleshooting the Microprocessor" on
		page 95.
	Memory failure.	See "Troubleshooting System Memory" on
		page 87.
	Possible expansion card	See "Troubleshooting Expansion Cards" on
	failure.	page 93.

About Your System

15