Dell 2520 owner manual Device Status Lights, Diagnostic Beep Codes

•Light off — Battery in full charge mode with AC adapter present.

•White light on — Battery in charge mode with AC adapter present.

Device Status Lights

Turns on when you turn on the computer and blinks when the computer is in a power management mode.

Turns on when the computer reads or writes data.

Turns on steadily or blinks to indicate battery charge status.

Turns on when wireless networking is enabled.

Diagnostic Beep Codes

The computer may emit a series of beeps during start-up if the display cannot show errors or problems. These series of beeps, called beep codes, identify various problems. The delay between each beep is 300 ms, the delay between each set of beeps is 3 seconds, and the beep sound lasts 300 ms. After each beep and each set of beeps, the BIOS should detect if the user presses the power button. If so, BIOS will jump out from looping and execute the normal shutdown process and power system.

Code	Cause and Troubleshooting Steps
1	BIOS ROM checksum in progress or failure
	System board failure, covers BIOS corruption or ROM error
2	No RAM detected
	No memory detected
3	Chipset Error (North and South Bridge Chipset, DMA/IMR/ Timer Error) , Time-Of-Day Clock test
	failure , Gate A20 failure , Super I/O chip failure , Keyboard controller test failure
	System board failure
4	RAM Read/Write failure
	Memory failure
5	Real-time clock power fail
	CMOS battery failure
6	Video BIOS test failure
	Video card failure
7	Processor failure
	Processor failure
8	Display
	Display failure

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