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94 Chapter 8
Interpreting LED Blink Codes
The LED on the front of the system blinks randomly while the system
powers up and runs power on diagnostics. If the system boot is
successful, the NT login screen appears on your monitor. If the boot is
unsuccessful, the LED blink codes may help you determine the error.
•
The LED blinks continuously if a fatal system board error occurs.
•
The LED blinks, then pauses, then blinks again if a memory error
occurs in slot group A. The blink code communicates the number
of the DIMM that failed (DIMMs in slot group A are numbered
A1 through A6).
For example, if the LED blinks once, then pauses, then blinks
again, the DIMM in slot A1 failed. If the LED blinks five times,
then pauses, then blinks five times again, the DIMM in slot A5
failed.
•
The LED blinks seven or eight times, then pauses, then blinks
seven or eight times again if a memory error occurs that
diagnostics cannot isolate to a particular DIMM.
Maintenance Tips
•
Shut down, power off, and unplug the workstation from an
electrical outlet before performing any hardware task.
•
Do not block the vents by placing objects around the workstation.
•
Always discharge any static electricity by touching the metal
chassis before beginning work on the DIMMs, processors, PCI
cards, and system board. Wear a wrist strap attached to the
chassis if you have one.
•
Do not plug in any cables to the workstation while the
workstation is running except audio, IEEE 1394, and USB cables.
•
Keep liquids away from the keyboard and workstation.
•
Periodically vacuum dust from the vents to maintain optimal air
flow through the system.
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Troubleshooting
