Dell OptiPlex 5055 Ryzen APU Tower Owners Manual - Page 79

Troubleshooting, Diagnostic and Power LED codes

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6 Troubleshooting Topics: • Diagnostic and Power LED codes • Enhanced Pre-Boot System Assessment - ePSA diagnostics Diagnostic and Power LED codes Table 34. Power LED states Power LED light status Off Steady/blinking amber Slow Blinking white light Steady white Possible cause Troubleshooting steps The computer is either turned ● Re-seat the power cable off or is not receiving power in the power connector on or in Hibernation mode. the back of the computer and the electrical outlet. ● If the computer is plugged into a power strip, ensure that the power strip is plugged into an electrical outlet and is turned on. Also, bypass power protection devices, power strips, and power extension cables to verify that the computer turns on properly. ● Ensure the electrical outlet is working by testing it with another device, such as a lamp. Computer fails to complete POST or processor failure. ● Remove and reinstall any cards. ● Remove and reinstall the graphics card, if applicable. ● Ensure the power cable is connected to the system board and processor. Computer is in sleep mode. ● Press the power button to bring the computer out of the sleep mode. ● Ensure all power cables are securely connected to the system board. ● Ensure the main power cable and front panel cable are connected to the system board. The computer is fully If the computer is not functional and in the On state. responding, do the following: Troubleshooting 79

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Troubleshooting
Topics:
•
Diagnostic and Power LED codes
•
Enhanced Pre-Boot System Assessment — ePSA diagnostics
Diagnostic and Power LED codes
Table 34. Power LED states 
Power LED light status
Possible cause
Troubleshooting steps
Off
The computer is either turned
off or is not receiving power
or in Hibernation mode.
●
Re-seat the power cable
in the power connector on
the back of the computer
and the electrical outlet.
●
If the computer is plugged
into a power strip,
ensure that the power
strip is plugged into an
electrical outlet and is
turned on. Also, bypass
power protection devices,
power strips, and power
extension cables to verify
that the computer turns
on properly.
●
Ensure the electrical outlet
is working by testing it
with another device, such
as a lamp.
Steady/blinking amber
Computer fails to complete
POST or processor failure.
●
Remove and reinstall any
cards.
●
Remove and reinstall
the graphics card, if
applicable.
●
Ensure the power cable is
connected to the system
board and processor.
Slow Blinking white light
Computer is in sleep mode.
●
Press the power button to
bring the computer out of
the sleep mode.
●
Ensure all power cables
are securely connected to
the system board.
●
Ensure the main power
cable and front panel
cable are connected to the
system board.
Steady white
The computer is fully
functional and in the On state.
If the computer is not
responding, do the following:
6
Troubleshooting
79