How can i fix my teka ha830 ?

we had a power failure in the night and our cooker clock as flashing when we got up this morning now the cooker wont let us adjust the time to set the clock at all tried all the buttons nothing works even tried switching oower of to see if it helps which it didnt now desparate to cook for our kids which are 5 and 1 and cant get help even from who makes the oven until monday lease can someone help