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

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