You are correct this is most likely to be a fuse if its totally dead.
The machine doesnt have a dead switch or fail safe mode.
I know you advised you checked the mains circuit but wanted to make sure what I would do is what you have done\proven.
In most common installations you have a service\utility switch above the worktop so you can turn the mains off without having to get to the plug socket the washer is connected to, could the switch have been accidentally turned off?
Have you checked your circuit breaker encase the washer is on a separate fuse (RCBO)?
If the above look ok, the next step is to pull the washer out. I would first unplug the washing machine and plug in another (working) mains powered device to confirm power is going to the socket.
Assuming the side lamp or what ever you use work, I would then remove the fuse from the washer's plug and test with a multi-meter (or just replace with a working fuse).
If the unit is still not coming on, its likely to be a loose wire, and it now gets move involved.
Let me know if the steps above resolve the issue, and if not I will happily talk you through troubleshooting the other internal workings.