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You can try resetting the roll out switch(es) (see attached pic for typical). They are located just outside the burner chamber. Turn the power off to the unit then try pushing the small button between the 2 leads on the switch. If it clicks you have reset it and the unit will fire up when you turn the power back on with any luck. If it doesn't click it wasn't tripped. There may be more than 1 so once you find the first one follow the wire to check for others in that circuit.
If that doesn't work then you probably have an issue with the limit circuit that usually requires a pro to sort out. I have to leave for about an hour. If you have more questions I'll respond when I get back. If not I'd appreciate a favorable rating.