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Startup Problems
Diagnostic
Lights Display
Error Code
On the rear of the system unit, there are eight recessed
amber-colored lights, as shown in Figure 13–2.
Figure 13–2 Position of Diagnostic Display Lights
MLO-008618
ISDN
S3
2
1
0
1 0234567
During system startup, the diagnostic display lights flash in
different patterns as the system startup tests are performed.
These light patterns represent the hexadecimal number of a test
action or result in binary format.
If your diagnostic display lights do not show the pattern in
Table 13–5, which represents the hexadecimal code DD, check
for possible startup problems and solutions in Table 13–6. If
Table 13–6 does not provide a solution, see Chapter 14.
Identifying a Problem 13–7