IBM 150, User Reference Manual

Page: 108 / 180

96
IBM® xSeries 150 : User’s Reference
Diagnostics panel
The following illustration shows the LEDs on the diagnostics panel on the system
board. See “Light path diagnostics table” on page 97 for information on identifying
problems using these LEDs.
Table 14. Power supply LEDs
AC power LED DC power LED Description and action
On On The power supply is on and operating correctly.
On Off There is a DC power problem.
Possible causes:
1. The Power Control button on the front of the
server is in the Off position.
Action: Press the Power Control button to
start the server.
2. The power supply has failed.
Action: Replace the power supply.
If the problem persists, have the system serviced.
Off Off There is an AC power problem.
Possible causes:
1. There is no AC power to the power supply.
Actions: Verify that:
• The power cord is properly
connected to the server.
• The power outlet functions
properly.
2. The power supply has failed.
Action: Replace the power supply.
If the problem persists, have the system serviced.