I was driving mi car & it just whent of i yried to started & it didnt turn on i change the started the alternater & it whont start

Won't start how ? When your the key to the start position what happens ? The engine spins but won't start an run . this a crank no start condition . If nothing happens when you turn the key to start ,this is a no crank no start condition . Need to be clear on this so we know what to have check . If nothing happens when turning the key to start position ,try moving gear selector to neutral - park neutral safety switch . If when you turn the key to start an the engine does spin but doesn't start an run ,check for spark ,fuel pressure . see what's missing .

check the tension on the drive belt can be adjusted to be slack a good indication is when you start up you get a squealing noise from the loose belt, so re adjust, clean the battery terminals

no year, mark. we cant fix cars, blind. need year. and engine option
I4 (4L) or V6?
is this a:
random no crank issue
randam wont start issue
or has no power from engine , enough power to drive and move
try to give details. or all is a waste

Sounds like your alternater, get a multimeter set it to volts start the car then check the battery is getting 14 or over volts from the alternater to the battery , if your getting less than that it's not putting enough volts back to the battery to run the car with good luck colin

SOUNDS TO ME LIKE FAULTY ALTERNATER AS WHEN ENGINE IS RUNNING ALTERNATER PRODUCES THE POWER NOT THE BATTERY

YOU HAVE A BAD HEAD GASKET! BURNING ANTI FREEZE

my car has the same exact problem!! i have 2 pop the clutch 2 get it started when it is hot. Mine starts great when its cold or hasn't ran 4 awhile but when we are driving around for more than about 20 min in it when we stop it doesn't start at all. it wont even turn over. so i have 2 have my husband push it while i pop the clutch & then it starts & runs fine till the next time we turn it off. its not a battery problem as we'v replaced the battery, & the starter & the alternater are fine as we'v had them tested. hopefully someone that knows & has fixed this problem can answer this mystery problem!! hopefully some1 can :D

Yes, alternator. Remove it and have it tested at your local perts store.

replace the voltage reulator some have it internal of the alternater if so then you need to replace the alternater

look at the starter wheel for missing teeth