Table A-1Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity

Beeps

Possible Cause

Recommended Action

 

 

 

 

Power LED flashes 12 times,

12

Health timer expired.

None.

once every second, followed

 

 

 

 

by a two second pause.

 

 

 

 

Beeps stop after third iteration

 

 

 

 

and the computer reboots.

 

 

 

 

 

 

 

 

System does not power on

None

System unable to power

Press and hold the power button for less than 4

and LEDs are not flashing.

 

on.

seconds. If the hard drive LED turns green, the

 

 

 

power button is working correctly. Replace the

 

 

 

system board.

 

 

 

OR

 

 

 

 

Press and hold the power button for less than 4

 

 

 

seconds. If the hard drive LED does not turn on

 

 

 

green then:

 

 

 

1.

Check that the unit is plugged into a

 

 

 

 

working AC outlet.

 

 

 

2.

Ensure that the DC power cable is plugged

 

 

 

 

into the I/O panel.

 

 

 

3.

Replace the power supply.

 

 

 

 

 

64 Appendix A Troubleshooting