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Troubleshooting your computer, Power led diagnostics, 5 troubleshooting your computer – Dell OptiPlex 7020 (Mid 2014) User Manual

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5

Troubleshooting Your Computer

You can troubleshoot your computer using indicators like Diagnostic Lights, Beep Codes, and Error

Messages during the operation of the computer.

Power LED Diagnostics

The power button LED located on the front of the chassis also functions as a bicolored diagnostic LED.
The diagnostic LED is only active and visible during the POST process. Once the operating system starts
to load, it is no longer visible.
Amber LED blinking scheme – The pattern is 2 or 3 blinks followed by a short pause then x number of
blinks up to 7. The repeated 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 14. Power LED Diagnostics

Amber LED State

White LED State

Description

off

off

system is OFF

off

blinking

system is in sleep state

blinking

off

power supply unit (PSU) failure

steady

off

PSU is working but failed to fetch code

off

steady

system is ON

Amber LED State

Description

2,1

system board failure

2,2

system board, PSU or PSU cabling failure

2,3

system board, memory or CPU failure

2, 4

coin-cell battery failure

2,5

corrupt BIOS

2,6

CPU configuration failure or CPU failure

2,7

memory modules are detected, but a memory failure

3,1

possible peripheral card or system board failure

3,2

possible USB failure

3,3

no memory modules are detected

3,4

possible system board error

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