Acer Altos R720 Series - Manual (Page 24)

1 System tour 14
Rear panel LED indicators
The illustration below shows the LED indicators located on the rear
panel.
Item
LED
indicator Function/
Status
Color Description
A Hot-swap
power
supply
module
status
indicator No power Off No AC power to the
power supply.
AC OK
indicator Green, on System has power applied
to it.
Green,
blinking AC power cord is plugged
into an active AC power
source.
Fault
indicator Amber • No AC power.
• Power supply critical
event (i.e, failure, fuse
blown, fan failed, etc.)
causing shutdown
Amber,
blinking Power supply displays
warning event (i.e., high
temperature, high power,
high current, slow fan,
etc.)
B Diagnostic
POST code
indicators* Trouble-
shooting
system Green/Red/
Amber, on Assists in troubleshooting
a system hang during
POST process.
Identifies the last POST
process to be executed.