I put a new radio in my car and now it wont start 1190 toyota

Did you in stall it your self ? if so make sure you didnt blow fuses and check the connections make sure you are getting power and if you put subs and power amp and stuff like that make sure you have enough battery power to power everything if not the car wont even turn at all cuz the juice is working on its own to start the radio. check also you didnt cut any wires while doing so and if you didnt install it your self and took it in then take it back something went wrong maybe....