Maintenance and Service Guide

Table Of Contents
Table 7-1 Interpreting POST diagnostic front panel lights and audible codes (continued)
Activity Beeps Possible cause Recommended action
4. Replace the system board.
Red power light ashes six
times, once every second,
followed by a two second pause.
Beeps stop after fth iteration
but lights continue until problem
is solved.
6 Pre-video graphics error. Replace the system board.
Red power light ashes seven
times, once every second,
followed by a two second pause.
Beeps stop after fth iteration
but lights continue until problem
is solved.
7 System board failure (ROM
detected failure prior to
video).
Replace the system board.
Red power light ashes eight
times, once every second,
followed by a two second pause.
Beeps stop after fth iteration
but lights continue until problem
is solved.
8 Invalid ROM based on bad
checksum.
1. Reash the system ROM with the latest BIOS
image.
2. Replace the system board.
Red power light ashes nine
times, once every second,
followed by a two second pause.
Beeps stop after fth iteration
but lights continue until problem
is solved.
9 System powers on but is
unable to boot.
1. Unplug the AC power cord from the computer,
wait 30 seconds, then plug the power cord back
in to the computer.
2. Replace the system board.
System does not power on and
lights are not ashing.
None System unable to power on. Press and hold the power button for less than 4
seconds. If the hard drive light turns white, 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 light does not turn on
white then:
1. Check that the unit is plugged into a working AC
outlet.
2. Replace the power supply.
Interpreting POST diagnostic front panel lights and audible codes 105