Three possibilites why the car won't start after using the battery when the car is off. (1) the battery may be old and not holding enough charge to re-start the car (2) the belt that drives the alternator may be loose (3) the alternator may be faulty.
Car battery is run down.
how old is your battery? is a original or aftermarket radio? well if you battery is older like 5 years may be is time to replace that. if you radio is a aftermarket make sure was installed correctly
Get spelling lessons!
Your battery is dead and you should probably take it to the repair shop and have them put it in for you. Couldn't it be the starter motor? The lights and radio come on, so there must be some juice and the battery.
How to install a battery?
Check the charge on your alternater.
Make sure connections are on tight.
vovlo wont start using key
articat atv366 wont start makes a cliking noise has good battery
Assuming it's like my Ford , you have to reset the preset radio stations every time a battery cable is disconnected
Check you battery
reincarnate your battery dudes XD