Owners Manual
Table Of Contents
- Dell Precision 7920 Tower Owner's Manual
- Contents
- Chassis
- Working on your computer
- Removing and installing components
- Screw size list
- Recommended tools
- Power supply unit (PSU)
- Side cover
- Air shroud
- Front bezel
- PCIe holder
- Intrusion switch
- Front system fan assembly
- Internal chassis speaker
- Hard disk drive and the Optical disk drive bezel
- Hard disk drive assembly
- NVMe Flexbay
- Front input and output bezel
- Front input and output panel
- Rear system fan
- Right side cover
- Hard disk drive and optical disk drive frame
- Slim Optical Disk Drive
- 5.25-inch optical drive
- Power distribution and fan control board
- Front HDD cable and fan assembly
- Fan bracket
- Graphical processing unit(GPU)
- Memory
- Coin cell battery
- Processor heat sink module
- System board
- RAID controller battery
- VROC module
- Technology and components
- System specifications
- System Setup
- Software
- Troubleshooting
- Contacting Dell
Preboot blinking power button codes
Table 20. Power button LED state
Power Button LED State Description
Off Power is Off. LED is blank.
Blinking Amber Initial State of LED at power up. See the table below for
Blinking Amber pattern diagnostic suggestions and possible
failures.
Blinking White System is in a low power state, either S1 or S3. This does not
indicate a fault condition.
Solid Amber The second state of the LED at power up, indicates that the
POWER_GOOD signal is active and it is probable that the
power supply is fine.
Solid White System is in S0 state. This is the normal power states of a
functioning machine. The BIOS will turn the LED to this states
to indicate it has started fetching op-codes.
Table 21. Diagnostic Indicator table
Power Light: Amber-White
Blinking
Amber/White Blinking
Pattern
Problem Description Suggested Resolution
1-1 1 amber blink followed by a
short pause, 1 white blink,
long pause, then repeats
Faulty System board
To troubleshoot the issue with
system board, contact Tech
support.
1-2 1 amber blink followed by a
short pause, 2 white blinks,
long pause, then repeats
Bad system board, Power
Supply or Power Supply
cabling
● If you can assist
to troubleshoot, narrow
down the issue with PSU
BIST Test, reseat cable.
● If nothing works, contact
Tech Support
1-3 1 amber blink followed by a
short pause, 3 white blinks,
long pause, then repeats
Bad system board, Memory or
Processor
● If you can assist
to troubleshoot, narrow
down the issue by
reseating memory and
swapping a known good
memory if available.
● If nothing works, contact
Tech Support
1-4 1 amber blink followed by a
short pause, 4 white blinks,
long pause, then repeats
Bad Coin cell
● Replace Coin cell
● If issue persists, replace
system board
2-1 2 amber blinks followed by
a short pause, 1 white blink,
long pause, then repeats
Bad Processor
● CPU configuration activity
is in progress or a CPU
failure was detected.
● Contact Tech Support
● If you can assist
to troubleshoot, narrow
down the issue by
ensuring CPU 0 is
installed, CPU0 and CPU1
is an idendical matching
pair and swapping a known
good CPUs if available.
● If nothing works, contact
Tech Support
120 Troubleshooting