Service manual

Chapter 3 Power-On Self-Test 3-15
Note – Press and hold the Stop key for approximately 5 seconds.
■ Stop and N Keys
To set the system NVRAM parameters to the original default settings, press and hold
the Stop and N keys before powering on the system. Continue to hold the Stop and
N keys until the system banner is displayed on the monitor.
3.8 System and Keyboard LEDs
The power LED, located at the chassis front, remains lighted when the system is
operating normally. The following figure shows the location of the power LED.
FIGURE 3-3 Power LED
While POST is executing and making progress, the Caps Lock key LED blinks while
the rest of the LEDs are off. If POST finds an error, a pattern is encoded in the LEDs
to indicate the defective part. If POST completes with no errors, all LEDs will be off
and the system will return to the OpenBoot PROM (OBP).
TABLE 3-2 on page 3-13
defines the keyboard LED patterns. FIGURE 3-2 shows the location of the LED keys
on the keyboard.
3.9 Initializing the Motherboard POST
To initialize the motherboard POST:
1. Power off the system unit.
See Section 6.2 “Powering Off the System Unit” on page 6-2.
Power LED