Car Alarms: 02 mustang not starting and alarm goes off, alarmtek, dash area

Question
hi, i have 02 mustang that wont start. i went to start my car yeserday and when i turn the key all the way i loss all power. when iturn the key back power comes back and aa few seconds later the alarm goes off. any suggestions?

Answer
"GOES OFF?"

I need to determine whether it's a factory alarm
issue or, if it's an aftermarket system you are
dealing with.

Is it: Headlights flashing, car horn honking
and a worded SECURITY" light in the dash flashing?
(doubtfull since none of the notes show this
car as having a factory alarm system)=FACTORY

Or,

is it: flashing parking lights,
an LED in the dash area, and a siren
going off?= AFTER MARKET

Let me know more on this to better
advise you on a course of action
to take.

Best Regards,

Robert Martin
CEO/ALARMTEK
CARALARMMAN.com