blown head gasket
You may have overheated the engine or seized it.
If the car overheated, you may have warped the aluminum head. You may have to have the head shaved and a new head gasket put in.
You may have blown a head gasket and it is so bad it has dumped coolant into the combustion chamber.
In modern vehicles, there are sensors which will prevent the engine from coming on when it is overheated. This is a protection measure.
No, not necessarily. I got hit by a car riding my bike a few weeks ago.
if the battery is good and charged sure
No changing the oil didn't cause this. Check to see that your cooling fan is operating.
It's overheated, probably. unless you have matches in there
Your engine overheated for whatever reason.
Usher got him a Lamborghini for his 16th birthday a few weeks ago. Lucky.