Power cut caused house alarm to crash...

Hi, I was called to my grandmothers today as her area has had a power cut. She told me that she has not been able to turn her house alarm on, so i checked all the main connections and they were ok. I noticed that all of the PIR's were also working, the only thing that didnt work was the keypad. I checked the connection between the keypad and the circuit board and they seemed ok. I was wondering if there was any way that i could test the functionality of the keypad?

If you needed to know, the alarm is am Optima XL4.

Thanks.