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Hello. Welcome to Just Answer. Please allow me to assist you. Please describe exactly what the engine does when you try to start it. Then go out and observe the following: With the headlamps ON, and the key turned to start, what do the headlamps do (dim, stay bright, nothing, go off, etc). Please advise.
If your battery is absolutely dead, it may not 'jump'. Try this: Hook the jumpers to the donor car normally. On the other car (that won't crank), hook the RED jumper wire to the POSITIVE Battery terminal/cable as normal. Do NOT hook the black jumper to the battery negative post. Clamp the BLACK jumper clamp onto something metal on the motor. Then start the donor car and try to start yours. This trick 'bypasses' the battery on the non-starting car. See if that works.
Do you hear a single click noise from under the hood when the key is turned to start?