Power-On Failure; System Leds; Drive Failure - Sun Microsystems Netra T4 AC100 Service And System Reference Manual

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 you press the ON/STBY switch.
Action
Ensure that a PSU is installed and properly seated. Check that the three PSU
fixing screws have been tightened.
Ensure that the AC power cord is properly connected to the system and to the
wall socket. Verify that the wall socket is supplying AC power to the system.
Press the ON/STBY switch. If the system does not power on, the CPU module(s)
may not be properly seated. Inspect the CPU module(s) for proper seating, and
press the ON/STBY switch again.
If the AC power wall socket is live and the CPU module(s) are properly seated,
but the system does not power on, the PSU may be defective. Check the status of
the PSU LEDs and see Section 4.4, "Power Supply Unit Troubleshooting" on
page 4-4.
4.2

System LEDs

The system LEDs located on the front and rear system panels provide information
about the status of the system and many of its subsystems. Refer to Section 1.4,
"LEDs" on page 1-6 for a description of their function.
4.3

Drive Failure

This section provides hard drive, DVD-ROM and DAT drive failure symptoms and
suggested actions.
4-2 Netra T4 AC100/DC100 Service and System Reference Manual • August 2001