Fridge / Freezer not cooling. No sound.
Could be low on coolant (freon), or could be a thermo switch. If the thermostat for the coil is not functioning, then it will cause it to ice over and not defrost. This is an easy fix on most freezers. Just let the freezer thaw completely, don't chop or break ice off. It could also be the thermostat timer. If it is not advancing, then it is not sending a signal to the defrost heater to thaw the coil. Easy way to check this is to manually advance the timer and see if you hear anything happen. Wait about 30 minutes and see if something changes, like the fridge coming back on. This would indicate the timer is working or not.