My 2007 ford focus will not start. Dash lights work when key is turned?

Also a loud chime sound just started for about 10 - 15 seconds after key is turned.

ALWAYS start at the battery and its cables, Clean and tighten cables and use your voltmeter/multimeter, to see if you've got 12.75 volts… Jump it and drive to parts store for FREE test of battery, alternator and starter

Battery does not contain sufficient charge to turn the starter or the immobiliser is not switching off.

Well here's a short list:
Battery is weak, only enough for the dash lights.
Bad battery connection.
Bad connection to the starter.
Bad starter.
Bad ignition switch.
Something wrong with the anitheft device