Had a power cut and my Accenta 8 keypad appears dead How do i fix?

Hi,
Last night while we were out our estate suffered a powercut. On returning home our alarm box was flashing. When i went into the house the alarm didnt sound. I tried to turn off the alarm but the keypad appears dead. There is a faint hint of green light behind the keypad but the buttons are unresponsive. I turned the power off to the whole house and on again but no change. The bell box is still flashing. My Neighbour who has the same alarm has the same problem. Any help appreciated.