Between 4 and 5 I do not quite understand, you lost power and then turned off the supply?
Do you mean the power light went out and to be safe you removed the fuse to the panel?
Now all power is off at the panel any noise outside?
Seems to possibly be 2 or 3 problems here.
Battery.
Mains.
External battery/incorrectly wired SAB (external sounder)
Alarm
October 2010