Sun Microsystems Ultra 5, Service Manual

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Chapter 4 Troubleshooting Procedures 4-3
Symptom 2
The system attempts to power on but does not boot or initialize the monitor.
Actions
1. Press the keyboard Standby (Power) key and watch the keyboard. The keyboard
LEDs should light briefly and you should hear a tone from the keyboard.
2. If you do not hear a keyboard tone or if the keyboard LEDs do not light briefly,
the system power supply may be defective. See Section 4.4 “Power Supply Test”
on page 4-5.
3. If a you hear a keyboard tone and the keyboard LEDs light briefly but the system
still fails to initialize, see Section 3.7 “Initializing Motherboard POST” on
page 3-23.
4.2 Video Output Failure
This section provides video output failure symptoms and suggested actions. Perform
the suggested actions until you isolate the problem.
Symptom
The video does not display at the system monitor.
Actions
1. Check the monitor power cord to ensure that the cord is connected to the monitor
and to the wall receptacle.
2. Verify that the wall receptacle is supplying power to the monitor.
3. Check the video cable connection between the monitor and the motherboard
video output connector.
4. Check that the CPU module is properly seated.
5. If video still does not display on the monitor, the monitor, graphics card, or
motherboard video chip may be defective.