2012 Mazda 3 did not start today. It sounded like it wanted to turn over but something prevented it from starting. Tapped brake, heard a pop. Didn't try a second time. Here's a pic of dash indicators

SOURCE: My 2004 530i won't start.

If you hear a mechanical hum then its either something with the starter or the battery. Charge your battery and see if its just a little too weak to turn the engine over. If that doesnt fix it, then you might have to replace the starter. Unless there is a serious mechanical issue, your engine shouldnt be the reason the starter can't get it to turn over.

SOURCE: 2oo3 mazda rx8 wont start

Have you checked if it has spark ? Check the spark by removing a sprk plug and connect it to the wire. Place the spark plug agains a groung. Then have somebody crank the engine. It should have spark.

SOURCE: Gurgle sound under driver side dash

It sounds like you may have a small air leak in your cooling system that is trapping air, and you can hear it gurgling through your heater core. I would keep an eye on your coolant level, and also you can rent a pressure tester from Auto Zone that you can hook up to your overflow tank and test your system for leaks. Most likely you will be able to tell where its leaking from, or see if its holding pressure like it's supposed to. Just follow the procedure closely and don't overpressurize the system.

SOURCE: Engine won't start. Dash lights flash rapidly when key turned.

the battery says 12 volts but may be dropping to 4 or 5 under a load...i would suggest jumpstarting the car and see what happens.the battery should read in the high 12 volts and not less than 9.5 under cranking. the dash lights go out on your car when starting,and the alarm will go off ,and disable the ignition if the voltage is too low in cranking the car because the computer will shut it down and activate the anti theft.....check your battery posts are tight. best of luck

SOURCE: 2006 GMC ENVOY starter not turning over, with ignition switch on.

the ignition switch is a problem with these vehicles so that would be my first call.