All burners will spark until the burner you are turning on lights. Make sure the burner and cap are on properly. Scratch the surface of the ignitor and also the burner where the spark hits. Make sure the little hole for the gas to come through the burner is clear and not clogged. You can get a manual at geappliances.com

Take all the burners off, remove the screws, then get a putty knife and push in on the spring clips at the front under the cooktop, thee are 2 of them. The burner that wont light, can you see the spark? And if you are refering to all the burners sparking when you said it did not do this before, yes actually it did do it before...All burners will spark when you turn on one burner, until the gas is lit. Once the gas is lit, the flame changes the resistance of the ignitor, and sends the signal to the spark module to tell it that the burner is lit, and to stop the spark.