Dell OptiPlex 7020 Small Form Factor Owners Manual - Page 47

Troubleshooting Your Computer, Power LED Diagnostics

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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 off off off blinking blinking off steady off off steady Description system is OFF system is in sleep state power supply unit (PSU) failure PSU is working but failed to fetch code system is ON Amber LED State 2,1 2,2 2,3 2, 4 2,5 2,6 2,7 3,1 3,2 3,3 3,4 Description system board failure system board, PSU or PSU cabling failure system board, memory or CPU failure coin-cell battery failure corrupt BIOS CPU configuration failure or CPU failure memory modules are detected, but a memory failure possible peripheral card or system board failure possible USB failure no memory modules are detected possible system board error 47

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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
47