Electrolux Fridge-Freezer Not Cooling

Hi all,

I woke up this morning to find that my integrated fridge/freezer was warm in both the fridge and freezer compartments. I removed it from its wall unit/cupboard to inspect it and it generally looks fine. No obvious signs of an issue like leaks, discolouration, wiring seems intact, etc. The fridge freezer details are:
Make: Electrolux
Model: KBI280
PCN: 925694696

However, I turned the fridge off to remove it from the cupboard and when I powered it again it seemed absolutely dead. The light is on in the fridge compartment (so power is reaching the appliance) but there are no sounds whatsoever. I lay on the ground next to the compressor for 10 minutes and heard nothing, no buzzes or ticks and no attempt from the compressor to do anything.

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I removed the compressor starter cover and all looked ok to me. The compressor seemed a likely candidate until I realised it was not making any noises.

Any thoughts on what I can do next (diagnostic steps) or possible causes?