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Are you saying that it only cranks for a second, and then stops? Then this sounds like dirty/loose battery cables. These often lead to a fried battery/starter. Remove, clean & tighten both ends of both cables & see what happens. If this doesn't fix it, jump it from another car & see if the situation improves. If it does, then it's probable that the battery's shot. If it doesn't, start looking at the starter, or starter soleniod (if so equipped.) Also, once you clean the terminals, turn the key to on, but do not start the car. Turn the headlights on high. Step on the brake & blow the horn at the same time. The horn should be loud, and the lights shouldn't dim more than a tiny bit. If they do, then the battery or cables are suspect.
What kind of car is it? Do you have a portable voltmeter or multimeter to test things?
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