My Car doesn't start up? I don't know why? on 2003 Hyundai Sonata

The previous owner of the car says he hasn't got this problem of starting up the car so he hasn't happened to change the timing belt.
It mileage is 130000 now. Please tell me what the problem could be and also suggest me a solution.

Asked by for the 2003 Hyundai Sonata
seek an insp of car and get an est on timing belt,its very likely needs a timing belt. if belt breaks it will cause cyl head damage