When you turn the oven knob on will it light on low flame with a match.If so then something has gone wrong with the ignition.If there is no gas at all check the clock isnt in automatic mode if it has one.If it does light with a match and comes up to full gas it may be best to use it that way as a repair bill could be pricey to put the ignition right,unless it is a battery operated ignition whereas it may just need a new battery.
Tony S, January 2009