My car will not start. Everything comes on (i.e. radio, lights) but it will not start.

is radio replacement an oem or aftermarket --when changing a radio which is part of anti theft system either need a unit that will flash or program to your vehicle

check fuses relays wiring then for battery failure--key/ cylinder worn /failure --starter failure

Here is an example of a stupid question

A guy --- tells you with no testing-- you have a fuse problem,really!

Can you tell me the problem--NO ONE CAN

It won't start --so someone on the internet should be able
to guess at it,again with NO TESTING what so ever

Tell them what's wrong with the radio,again really,The Car Won't
Start, who cares about the radio,you can't use the car

turn key and no radio or lights? Battery.
If everything comes on when key turned but does not start could be a lot of things. Need more info.

You folks never learn, you can't use just any aftermarket sound system in these newer vehicles. The electronics are all networked together. I have no idea what you have damaged.

The randomness of the power coming onto the electronics is indicated by a loose wire, you should have a shop technician check your wiring, however wiring can be very costly.

need to check your starter before going to check the sensor.

changed ignition switch... lights come on and everything but wont start... wats the prob?

Check and clean the battery terminals, just went through this exact same problem myself this week! Google "clean battery terminals" if you have never done this before, pretty easy.

On my girlfriends sl1 the engine would not turn over at all and I took the starter off and it was fried! I replaced it and it started right away, but I never had a problem with the lights not coming on.