I have anaccenta/optima G3 intruder system all zones have stopped working ?

I have added an extra zone to my system but ever since all the other zones have stopped working, where as before when the system was not armed each PIR would have a red flashing light on it when it picks someone up in it's fiels now there's nothing, also the system wont set, could it be that I've blown a fuse inside ? the tamper still works on all zones and door contact's still works, any ideas ??????????