So keypad no1 or 2 is not responding,
You forgot to include make/model of your alarm,for all we know it could be a wireless system.
LCD or LED keypad ??,
what is it saying?,lights lit or are any flashing?,it sounds like a duff battery at this stage but can't give you a proper answer without the above info.
Post back on here and tell us more :)
Regards e manno
e manno, December 2012