Rep Power: 0

SOMETIMES when i try to turn the car on, the car wont turn over not even a click, it wont even try to turn over, but if i constantly twist the key on to start it eventually turns over from maybe a spark and the car starts. but this only happens 40% of the times...sometimes the car starts on the first try. i think it could be an electrical spark problem..i need HELP!! could it be ignition switch or starter??