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Issue 2.0 June 2004 177
Diagnosing LED patterns
Many hardware components of the computer have LEDs that can be used to diagnose
problems. This section describes the following patterns:
● Front panel LEDs on page 177
● PCI slot LEDs on page 179
● Power supply LEDs on page 181
● Disk drive LEDs on page 182
● Tape drive LEDs on page 184
Front panel LEDs
The system status and control panel, shown in the following figure, includes several LED
status indicators, a power button, and a security key switch.