Dell 7810 owner manual Troubleshooting Your Computer, Diagnostic LEDs

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Troubleshooting Your Computer

You can troubleshoot your computer using indicators like Diagnostic Lights, Beep Codes, and Error Messages during the operation of the computer.

Diagnostic LEDs

NOTE: The diagnostic LEDs only serve as an indicator of the progress through the Power-On Self Test (POST) process. These LEDs do not indicate the problem that caused the POST routine to stop.

The diagnostic LEDs are located on the front of the chassis next to the power button. These diagnostic LEDs are only active and visible during the POST process. Once the operating system starts to load, they turn off and are no longer visible.

Each LED has two possible states of OFF or ON.

NOTE: The diagnostic lights will blink when the power button is amber or off, and will not blink when it is white.

Table 14. POST Diagnostic LED Patterns

Power LED State	System State	Notes
Off	S5/S4	Normal- System is Off/Hibernate
Blinking White	S3	Normal- System is in Standby/Suspend
Blinking Amber	N/A	Abnormal- PSU cannot turn on, recommend PSU BIST.
		Replace PSU.
Steady White	S0	Normal- System is on functioning
Steady Amber	N/A	Abnormal- System cannot turn on, recommend check
		motherboard components or replace motherboard.

NOTE: Amber LED blinking scheme pattern is 2 or 3 blinks followed by a short pause then X number of blinks up to 7. Pattern has a long pause inserted in the middle. For example 2,3 = 2 amber blinks, short pause, 3 amber blinks followed by long pause then repeats.

Table 15. POST Diagnostic LED Patterns

Blink Patter

2,1

2,2

System State

A possible system motherboard failure has occurred.

A possible PSU or cabling issue has occurred.

Notes

Recommend replace motherboard.

Run PSU BIST.

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