Turn off the power to the appliance and let it sit for at least 30 minutes. Turn the power back on and see if the ignitors work. If not, and if all of them are out, it sounds like you may have a bad ignitor board or possibly a loose connection. Typically, the top of the stove has to be removed to access this board, but check you manual first if you have one.
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Try these steps first:
Turn off the power to the appliance and let it sit for at least 30 minutes. Turn the power back on and see if the ignitors work. If not, and if all of them are out, it sounds like you may have a bad ignitor board or possibly a loose connection. Typically, the top of the stove has to be removed to access this board, but check you manual first if you have one.