Dell 840 manual Diagnostics Indicator Codes

Diagnostics Indicator Codes

Four diagnostic indicator lights are located behind the bezel on the I/O control panel. To access the lights, see "Opening the System" on page 43. These lights display error codes during system startup. Table 1-4 lists the causes and corrective actions associated with these codes and the power light status before system POST. Table 1-6 lists the causes and possible corrective actions for these codes during POST. A highlighted circle indicates the light is on; a non-highlighted circle indicates the light is off.

Table 1-4. Diagnostic Indicator Codes

Code Causes Corrective Action

No power is applied to the system.

See "Troubleshooting Power Supplies" on page 98.

A B C D

A possible processor	See "Troubleshooting the Microprocessor" on
failure has occurred.	page 109.
A B C D
Memory failure.	See "Troubleshooting System Memory" on
	page 100.
A B C D
Possible expansion-card	See "Troubleshooting Expansion Cards" on
failure.	page 108.
A B C D
Possible video card	See "Troubleshooting Expansion Cards" on
failure.	page 108.
A B C D
Diskette or hard-drive	Ensure that the diskette drive and hard drive(s)
failure.	are properly connected. See "Hard Drives" on
A B C D	page 53 for information on the drive(s)
	installed in your system.

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