Troubleshooting 43
To interpret blinking LED error codes on the system logic board:
The LED displays the two-digit decimal error code in the following
pattern:
First digit
!
2-second pause
!
second digit
!
6-second pause
Each digit is represented by the corresponding number of blinks: on for
0.5 seconds and off for 0.5 seconds.
For example, if there is a ROM checksum error (error code 12), the system
logic board LED:
Blinks one time
!
pauses for 2 seconds
!
blinks two times
!
pauses
for 6 seconds
!
repeats the sequence.
Power−Up Error Code (12)
On
Off
Blinking error
code is repeated.Level 0
2 sec 6 sec
See Table 3–1 for a list of error codes and recommended solutions.
Level 1 LED Error Codes
After level 0 testing is complete, the operating system starts and level
1 testing starts. When a level 1 error occurs, the screen displays an
error message in the upper-left corner and testing continues. When level
1 testing is complete, the keyboard bell does not ring and diagnostics
displays the error message in three places.
• On the screen, in the diagnostic summary box
• On the keyboard LEDs (one time, no repeat)
• On the system logic board LED (one time, no repeat)
To interpret blinking error codes on the keyboard LEDs:
For each two-digit error code, the first digit blinks on the hold LED and
the second digit blinks on the lock LED.
The pattern of blinks is
First digit
!
2-second pause
!
second digit
!
6-second pause
Each digit is represented by the corresponding number of blinks: on for
0.5 seconds and off for 0.5 seconds.
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