HP ProDesk 400 G7 SFF Maintenance And Service Manual page 105

Table 7-2 Interpreting POST diagnostic front panel lights and audible codes (continued)
Activity
Red power light blinks nine times,
once every second, followed by a
two-second pause. Beeps stop
after fifth iteration, but lights
continue until problem is solved.
System does not turn on and
lights are not blinking.
ENWW
Beeps Possible cause
9 System turn on but cannot
boot.
None System cannot start.
Interpreting POST diagnostic front panel lights and audible codes
Recommended action
1. Unplug the power cord from the computer, wait
30 s, then plug the power cord back in to the
computer.
2. Replace the system board.
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. Be sure that the unit is plugged into a working
AC outlet.
2. Replace the power supply.
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