check your battery cables and you ground. You may want to check your alternator, if the car only starts when jumped started. IMprovement to answer: If the new battery doesn't start the car, obviously it's not the alternator causing the car not to start... Check the starter relay under the hood if it is equipped and if that works then check the starter solenoid located beside the starter motor. If that's working then you can be pretty sure it's the starter motor causing your problem - maybe worn brushes or excess resistance in the circuit.
try checking your fuses and fuse-able links
In most cases a new battery will be charged enough to start the vehicle
the only way to start a car when the remote key is dead is to start it by putting the key into the ignition.
There is absolutely nothing you can do to make your legs longer. Better start liking the ones you have.
Absolutely nothing; it doesn't exist. You could start up your own club perhaps.
what kind of "not start" ? Won't turn over? Nothing? What are the symptoms?
Engine ground can find many paths to the battery, but if NOTHING is connected to the negative post... no, it won't start.
Yes, the battery starts the engine, and as long as the battery is fully charged the engine will start. The battery will loose it's charge if the alternator is defective and not replenishing the charge of the battery but the alternator has nothing to do with starting the engine.
Could be your park/neutral switch try putting the car into neutral and and then starting it.
I would start by checking the battery and fuses.
first find out if the engine is getting spark or fuel. if the engine is not turning over or absolutely nothing is happening, find out if the starter is receiving current.