You need to reset it by the looks of it. Try pushing and holding in any programme buttons / knobs for 5 sec or so to re set the thing. Even turning off the main power switch at the wall for sev min if it has one. another posibility is that the powercut has produced a surge or spike that has damaged the onboard "computer" -hopefully not.
SOURCE: function button keeps failing
only do this if you relay know what you are doing. try asking your local appliance second hand shop it will save you time and money
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