Dear oh dear! when is the funeral? Don't rush yet? if everything is dead, its actually a good news. It means it will awake up again, its just gone into deep long sleep, so give it a chance it will awake up, but you will need to do something to awake it up, check its internal wiring and a trace live going into various branches, incoming live should go to door light switch, which brings the light on, and other branches off this incoming live would be through a thermostat to compressor motor, fan etc, most likely the problem is disruption to this incoming live, or it can even be the Neutral circuit.
You will need some sort of diagnostic equipment such as a multi meter, with resistance or continuity check, the way to go would be trace how far does live from the 3 pin plug buzzes at each of those points I mentioned earlier, i.e. door switch, thermostat, then look for obvious faults if the resistance reading or if it doesn't buzz, you have fault on live circuit, check with thermostat being turned up and down, also with door switch being pushed in and out, same way check Neutral circuit if it has continuity with 3 pin plug's N, remember the right pin on a 3 pin plug when looking from its cover side is the live, or it would be left if you were looking from pin side. Fridges also have incoming mains filtering, it may be that just your filter has conked out.
