No power

When you say there is no power do you mean your headlights won't turn on and the car won't start or do you mean it is just not cranking and will not start. If it is not cranking, your lights and radio work, and none of the starter fuses are blown then there may be an issue with your starter. What you can do to test this is to gently tap the starter a couple of times with a wrench or hammer and if the car then starts the starter is going bad and needs to be replace.

It might be the key. It has a chip in it. It might be damaged

Changed starter sparked no power won't start