Is there power to the starter "S" terminal? What car?
your alternator may have went out so the car was running on the battery, once the battery died..... so did the car.
it is still running off the battery, most of the time it will turn off when you open the door
Your car won't turn on.
Did you notice the lights dimming and loss of power before it died?, if you did, it might be an alternator problem, or a loose or corroded battery terminal, or the battery itself., Check the voltage on the dash board, with the the key on, if its under 12v, the battery charge is low,remove and clean the battery terminals, give it a boost, if it starts and dies as soon as you remove the jumper cable, it´s definitely the alternator.
your engine wont turn over but it makes a clicking noise or if you turn the key to the notch before the one that turn on your car then turn on your radio and if it doesn't turn on you have a dead battery.
If you are using it to turn on the car a good battery would help.
Your battery is probably dead.
Does it turn over? Does it have spark? Does it have fuel? Does it turn over? Does it have spark? Does it have fuel?
Because your alternator is shot.
Yes, A car battery can have enough charge to turn on car electrical components but not start the car. This is not much of an indication of a bad battery however. Use a volt meter to test the power in the battery. If the battery seems low put it on a trickle charge. Most modern chargers will tell you if your battery is bad or not. The battery also has to be load tested to determine if it's good or not.
your key is probably still in the ignitionA bit more:The clock in my car continues to run even after I turn it off and remove the keys. The car battery is what keeps the clock running, but it uses so little power that there's no danger of it running down your car battery as it would if you left your headlights on.
I would check the weiring harness from the car to the starter