1.Turn off the computer and disconnect all external devices.

2.Power-on the computer.

3.There are three LEDs to help you determine if the power supply and system board are working correctly. The power button LED is located on the front of the computer and the two diagnostic LEDs are located on the power supply at the rear of the computer. After pressing the power button, observe the LEDs and refer to the following table:

 

Green

Yellow

 

Power LED

diagnostic LED

diagnostic LED

Action

 

 

 

 

ON

ON

OFF

This is the normal condition of the LEDs when the power is

 

 

 

OK.

 

 

 

 

OFF

OFF

OFF

v Make sure the power cord is attached to a working

 

 

 

electrical outlet.

 

 

 

v Check the power cord for continuity.

 

 

 

v If the problem persists, replace the power supply.

OFF (after the

ON

OFF

Replace the system board

power button

 

 

 

has been

 

 

 

pressed)

 

 

 

 

 

 

 

ON

ON

ON

Replace the power supply

 

 

 

 

If the Diagnostic LEDs are in the normal condition and the problem persists, replace the system board and the microprocessor, one at a time, until the computer works correctly.

60Hardware Maintenance Manual

Page 66
Image 66
Lenovo 8098 manual Make sure the power cord is attached to a working