car is not starting on 2005 Dodge Magnum

all the lights come on and is just dont start it did this before and i changed the fuse in the back and it started bu naw is not and a checked the fuse and fose is good s wat could it be

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1 answer
did you get your car key wet at all? by washing/rain etc? I think the keyfob does a handshake with the car when it attempts to start.