Why wont my car start ?

Hello, sounds like the battery is low in charge. This can be as a result of something electrical in the vehicle running it down, like a light left on, or using the battery power to run vehicle accessories with the engine off. Have the battery fully charged and tested to see if it is still good. If so, check the rest of the charging system to ensure it is working properly. If not, then the battery will need replaced. Depending on your mileage, it may still be covered by Hyundai's factory warranty. Worth checking into.