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Pull off the knob and swap it for one of the burners that work. Hopefully, it is just a broken knob. If that does not solve the problem, then you may try to gently turn the shaft under the knob to see if it will turn, You may have to push it slightly while turning it to the right. If the knob just spins around without a stopping point, that would indicate that something is broken and you will have to get a qualified technician out to fix it. Try these two suggestions and tell what you find.
Ok , as I stated before, if the shaft just spins around, then something is broken inside the gas valve and it will have to be replaced. I would suggest that you get a tech out to do the repair as you will need to take the control panel off to access the tubing and other parts to remove the valve.
You will have to turn off the gas at the supply if you can not manipulate the valve to close off the flame to the burner.
Did you have any other questions?