How do I reset shut off switch alarm system?

My car was running fine then it just stopped. It cranks like it's going to start but doesnt. Tried spraying starter fluid and that didn't work. A mechanic said that the alarm system has a switch and a button that implies that it's a shut off switch that I guess uses combinations to set. How can I go around this or can i? All the fuses are good. The electrical is good. But before, my car did not beep when I locked/unlocked it now it beeps 2 times when unlocked and 1 time when locked. And the lights before, the little side dot red light on the drivers side always stayed on. Now it blinks. There's another red light on the dash, which now illuminates. The mechanic said that he now suspects the car having 2 alarms in it because the shut off switch one does not come stuck. Please any information will help.