Table 1: LED status summary
LED State Meaning
Blue ON continuously Normal operation. All systems OK.
Blinks 5 times Transition from quiet mode to high-power
cooling.
OFF No AC current.
Constant
blinking
CPU fan stalled.
(If the CPU fan stalls blinking of the LEDs is
preceded by a screen warning.)
Green (inner) ON Receiving 5V through PCI connector.
OFF Not receiving 5V through PCI connector.
Green (outer) ON Receiving 12V through PCI connector.
OFF Not receiving 12V through PCI connector.
Blinking Short or overload in one of the fans.
Troubleshooting suggestions
Table 2: Troubleshooting suggestions
Problem LED status Possible cause Action
PC does not
power up or
resets
continuously.
Blue LED
permanently
OFF.
No power to
AC4G PCI card.
Check power cord from AC4G
PCI card bracket to electrical
mains.
No power to PC Check power cord from
computer to mains.
Screen alert
appears, then
screen blanks
out.
Blue LED
blinking.
CPU fan stalled. Make sure CPU fan is working
properly (it may be jammed
by a physical obstruction or
disconnected from the power
source).
Active Monitor
on computer
screen
indicates that
CPU fan is not
working.
Connector from
Cooling Unit to
motherboard
not properly
connected.
Make sure connector from
Cooling Unit to motherboard
is connected properly to the
CPU fan connector on the
motherboard.
Active Cool AC4G User's Manual 9
