Troubleshooting; System Diagnostic Lights - Dell Precision 5550 Service Manual

System diagnostic lights

When static, the power and battery-charge status light indicates the power mode that your computer is in. When blinking in different
patterns, the power and battery-charge status light indicates the respective issues that your computer is encountering.
Static power and battery-charge status light
The following table lists the status of your computer based on the power and battery-charge status light.
Table 19. Power and battery-charge status light
Power and battery-charge status light
Solid white
Amber
Off
Blinking power and battery-charge status light
The power and battery-status light blinks alternately between amber and off to indicate issues that your computer is encountering.
For example, the power and battery-status light blinks amber two times followed by a pause, and then blinks white three times followed by
a pause. This 2,3 pattern continues until the computer is turned off indicating no memory or RAM is detected.
The following table shows the different power and battery-status light patterns and the associated issues.
Table 20. LED codes
Diagnostic light codes
2,1
2,2
2,3
2,4
2,5
2,6
2,7
2,8
3,1
3,2
Status of computer
• The power adapter is
connected and the battery is
fully charged.
• The power adapter is
connected and the battery
has more than five percent
charge.
The computer is running on
battery and the battery has less
than five percent charge.
The computer is in sleep state,
hibernation, or turned off.
Problem description
Processor failure
System board: BIOS or ROM (Read-Only Memory) failure
No memory or RAM (Random-Access Memory) detected
Memory or RAM (Random-Access Memory) failure
Invalid memory installed
System-board or chipset error
Display failure
LCD power rail failure.
CMOS battery failure
PCI, video card/chip failure

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