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Blinking Amber, Problem Description

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NOTE: Amber LED blinking pattern : 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. Example 2,3 = 2 amber blinks, short pause, 3 amber blinks followed by long pause then repeats. Table 35. Diagnostic power LED codes State State Name - - Blinking Amber Pattern 2 blinks > short pause > 1 blink > long pause > repeats Problem Description Bad Motherboard Suggested Resolution Replace the motherboard - - 2 blinks > short pause > Bad Motherboard, Power If customer can assist to 2 blinks > long pause > repeats Supply or Power Supply cabling troubleshoot, narrow down the issue with PSU BIST Test, reseat cable. If nothing works, replace the motherboard, power supply or cabling - - 2 blinks > short pause > Bad Motherboard, If customer can assist to 3 blinks > long pause > repeats Memory or Processor troubleshoot, narrow down the issue by reseating memory and swapping an available known good memory. If nothing works, replace the motherboard, memory or processor - - 2 blinks > short pause > Bad coin cell battery If customer can assist to 4 blinks > long pause > repeats troubleshoot, narrow down the issue by swapping a known good coin cell battery if available. If nothing works, replace the coin cell battery S1 RCM 2 blinks > short pause > BIOS Checksum Failure System is in Recovery 5 blinks > long pause > Mode. repeats Flash latest BIOS version. If problem persists, replace the motherboard S2 CPU 2 blinks > short pause > Bad Processor CPU configuration activity is in progress or a 6 blinks > long pause > CPU failure was repeats detected. Replace the processor S3 MEM 2 blinks > short pause > Memory failures Memory subsystem 7 blinks > long pause > repeats configuration activity is in progress. Appropriate memory modules were detected but a memory failure has occurred. If customer can assist to troubleshoot, narrow down the issue with 76 Troubleshooting

Section	Page
Dell OptiPlex 5055 Tower Owner's Manual	2
Working on your computer	5
Safety instructions	5
Turning off your computer	5
Turning off your — Windows	5
Before working inside your computer	6
After working inside your computer	6
Chassis overview	7
Front chassis view	7
Back chassis view	8
Field service information	9
Screw size list	9
Recommended tools	9
Critical callouts	9
Trusted Platform Module	9
China TPM Installation	10
System Board Configuration	10
Enabling data wipe option in BIOS	13
System board jumper setting	13
LED error code after replacing coin cell battery	14
Working on your computer	14
Safety instructions	14
Turning off your computer	14
Turning off your — Windows	14
Before working inside your computer	15
After working inside your computer	15
Safety precautions	15
Electrostatic discharge—ESD protection	16
ESD field service kit	16
Transporting sensitive components	17
Disassembly and reassembly	17
Side Cover	17
Removing Side Cover	17
Installing Side cover	19
Front Bezel	19
Removing front bezel	19
Installing front bezel	21
Front panel door	21
Opening the front panel door	21
Storage device	22
Removing 3.5–inch hard drive assembly	22
Removing 3.5–inch hard drive from the hard drive bracket	25
Installing 3.5–inch hard drive into the hard drive bracket	26
Installing 3.5–inch hard drive assembly	26
Removing 2.5–inch hard drive assembly	26
Removing 2.5–inch hard drive from the hard drive bracket	27
Installing 2.5–inch hard drive into the hard drive bracket	28
Installing 2.5–inch hard drive assembly	28
Optical drive	28
Removing optical drive	28
Installing optical drive	30
M.2 PCIe SSD	30
Removing optional M.2 PCIe SSD	30
Installing optional M.2 PCIe SSD	31
SD card	31
Removing SD card reader	31
Installing SD card reader	32
Memory modules	32
Removing memory module	32
Installing memory module	33
Expansion card	33
Removing PCIe expansion card	33
Installing PCIe expansion card	34
Power supply unit	35
Removing power supply unit – PSU	35
Installing power supply unit – PSU	36
Intrusion switch	36
Removing intrusion switch	36
Installing intrusion switch	37
Power switch	37
Removing power switch	37
Installing power switch	39
Speaker	39
Removing speaker	39
Installing speaker	41
Coin-cell battery	41
Removing coin cell battery	41
Installing coin cell battery	42
Heat sink assembly	42
Removing heat sink assembly	42
Installing heat sink assembly	43
Processor	44
Removing the processor	44
Installing the processor	44
System fan	45
Removing the system fan	45
Installing the system fan	46
System board	46
Removing the system board	46
Installing the system board	50
System board layout	51
Technology and components	52
Systems management features	52
In-Band Systems Management – Dell Client Command Suite	52
Out-of-Band Systems Management – DASH	53
AMD APUs, AMD Ryzen CPUs and APUs	53
AMD Accelerated Processing Unit - APU	53
AMD Ryzen	53
AMD Ryzen APUs	53
AMD PT B350	54
AMD Radeon R7 M450	54
AMD Radeon R5 M430	54
USB features	55
DDR4	57
Active State Power Management	58
System setup	59
Boot menu	59
System Setup options	59
Updating the BIOS in Windows	65
Updating BIOS on systems with BitLocker enabled	65
Updating your system BIOS using a USB flash drive	65
Updating the Dell BIOS in Linux and Ubuntu environments	66
Flashing the BIOS from the F12 One-Time boot menu	66
Technical Specifications	70
Troubleshooting	75
Diagnostic and Power LED codes	75
Enhanced Pre-Boot System Assessment — ePSA diagnostics	79
Getting help	80

Match case Limit results 1 per page

NOTE:

Amber LED blinking pattern : 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. Example 2,3 = 2 amber blinks, short pause, 3 amber

blinks followed by long pause then repeats.

Table 35. Diagnostic power LED codes

State

State Name

Blinking Amber

Pattern

Problem Description

Suggested Resolution

2 blinks > short pause >

1 blink

> long pause >

repeats

Bad Motherboard

Replace the motherboard

2 blinks > short pause >

2 blinks > long pause >

repeats

Bad Motherboard, Power

Supply or Power Supply

cabling

If customer can assist to

troubleshoot, narrow

down the issue with PSU

BIST Test, reseat cable.

If nothing works, replace

the motherboard, power

supply or cabling

2 blinks > short pause >

3 blinks > long pause >

repeats

Bad Motherboard,

Memory or Processor

If customer can assist to

troubleshoot, narrow

down the issue by

reseating memory and

swapping an available

known good memory.

If nothing works, replace

the motherboard,

memory or processor

2 blinks > short pause >

4 blinks > long pause >

repeats

Bad coin cell battery

If customer can assist to

troubleshoot, narrow

down the issue by

swapping a known good

coin cell battery if

available.

If nothing works, replace

the coin cell battery

RCM

2 blinks > short pause >

5 blinks > long pause >

repeats

BIOS Checksum Failure

System is in Recovery

Mode.

Flash latest BIOS version.

If problem persists,

replace the motherboard

CPU

2 blinks > short pause >

6 blinks > long pause >

repeats

Bad Processor

CPU configuration

activity is in progress or a

CPU failure was

detected. Replace the

processor

MEM

2 blinks > short pause >

7 blinks > long pause >

repeats

Memory failures

Memory subsystem

configuration activity is in

progress. Appropriate

memory modules were

detected but a memory

failure has occurred.

If customer can assist to

troubleshoot, narrow

down the issue with

Troubleshooting