The SYS lamp on the firewall turn to red ,it should be green when it is normal.
Check the log information and find one power supply is the situation of power outage.
%Jun 20 17:18:50 2009 USG3000 SRM/4/PwrLoss:Power 2 loss.
%Jun 20 17:19:00 2009 USG3000 SRM/4/PwrPlug:Power 2 plug out.
%Jun 20 17:19:00 2009 USG3000 SRM/4/PwrLoss:Power 2 loss.
Inspect power supply and find the power cable is instability,poor contact,the alarm is missing after fixuping the power cable.
%Jun 10 16:39:11 2009 USG3000 SRM/4/PwrPlugIn:Power 2 plug in.
Maybe there are some problem with system fault or hardware fault.