Dell 3020 MT Owner's Manual Page 47
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- Table of contents
- TROUBLESHOOTING
- BOOKMARKS
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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 breathing 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
3,5 memory modules are detected, but a memory configuration or compatibility error
47
- Dell OptiPlex 3020–Mini Tower 1
- Owner's Manual 1
- Notes, Cautions, and Warnings 2
- Contents 3
- Working on Your Computer 5
- Turning Off Your Computer 6
- Recommended Tools 9
- System Overview 9
- Removing the Cover 10
- Installing the Cover 11
- Removing the Intrusion Switch 12
- Removing the Front Bezel 12
- Installing the Front Bezel 13
- Removing The Expansion Card 13
- Installing the Expansion Card 14
- Memory Module Guidelines 15
- Removing the Memory 15
- Installing the Memory 15
- Removing the Hard Drive 16
- Installing the Hard Drive 17
- Removing the Optical Drive 17
- Installing the Optical Drive 18
- Removing the Speaker 18
- Installing the Speaker 18
- Removing the Power Supply 19
- Installing the Power Supply 20
- Removing the Processor 21
- Installing the Processor 21
- Removing the System Fan 21
- Installing the System Fan 22
- Removing the Power Switch 23
- Installing the Power Switch 24
- Removing the I/O Panel 24
- Installing the I/O Panel 26
- System Board Components 27
- Removing the System Board 28
- Installing the System Board 30
- System Setup 31
- System Setup Options 32
- Table 3. System Configuration 33
- Table 4. Video 34
- Table 5. Security 34
- System Password 35
- Computrace Service 35
- Absolute Software 35
- Table 6. Secure Boot 36
- Table 7. Performance 37
- Table 8. Power Management 37
- Table 9. POST Behavior 38
- Table 11. Maintenance 39
- Table 12. Cloud Desktop 39
- Updating the BIOS 40
- System and Setup Password 41
- Disabling a System Password 43
- Diagnostics 45
- Troubleshooting Your Computer 47
- Beep Code 48
- Error Messages 48
- Technical Specifications 53
- Table 25. Internal Connectors 55
- Table 26. Controls and Lights 55
- Table 27. Power 56
- Table 28. Physical 56
- Table 29. Environmental 56
- Feature Specification 57
- Contacting Dell 59
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