Sun Microsystems Netra t 1120, Service Manual

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4-2 Netra t 1120/1125 Service Manual • August 1998
4.1 Power-On Failure
This section provides examples of power-on failure symptoms and suggested
actions.
Symptom
The system does not power up when the power switch is pressed.
Action
Check that the input power connector(s) is/are correctly fitted. Check that the
external circuit breaker(s), if fitted, is/are correctly set.
Press the power switch at the front of the system unit. If the system powers on, no
further action is required. If the system does not power on, one of the CPU modules
may not be properly seated. Remove the top cover and inspect each CPU module for
proper seating. If the system powers on, no further action is required.
If the input power has been verified, each CPU module is properly seated, and the
power-on key has been pressed but the system does not power up, the system power
supply may be defective. See Section 4.3 “Power Supply Test” on page 4-5.
Symptom
The system attempts to power up but does not boot.
Action
Press the power-on button. If the system unit still fails to boot, refer to Section 3.6
“Motherboard Test” on page 3-22.