Ok the first thing to do is turn the breaker all the way off then all the way back on again. If that fails to clear the problem then it very likely the clock (control board) has shorted, this will need to be replaced.
Because I don't have the model number I will have to kind of take a educated guess how it comes apart.
Open the oven door, Look under the control panel, there should be a bunch of screws holding the control panel in place, Remove these screws then the end caps should come off, You should then be able to grab the front of the control panel and lift it to gain access to the control board. If the panel will not lift you may need to access the control by lifting the cook top, This means the unit will need to be pulled out and the screws taken out from the cook top.
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