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Obviously the exact cause of the noise must be located in order to know what needs to be fixed. Fridge/freezer cabinets aren't particularly rigid and so it is very important they stand on a firm surface and they are properly levelled using the adjustable feet and a spirit level. The cabinet should not "rock". The fridge will give a longer more trouble free life when properly levelled and often quieter...
Apart from a condenser fan at the rear (if fitted) which shouldn't run continuously, lots of modern fridges/freezers have internal fans to circulate the air to produce a more uniform temperature throughout. These fan(s) start when the door has been open and then closed and will run only for a relatively short time and due to the cold often damp conditions, they are prone to making strange noises.
Hi softwaredude with an LG GR-727R refrig. The occasional build up of water on the bottom of the fresh foods sections tells me that the refrig is going through it's defrost cycle, but that the defrost drain is plugged. If you take the back off the refrig. you will see a plastic tube about 1/2 inch diameter with a few ribs on it going from the top of the compressor compartment to the bottom, which is a defrost water holding / evaporating pan. Look to see if that tube is plugged. If not, it is plugged further up, most likely where the defrost water drains off the evaporator (that the coils behind the freezer wall that do all the cooling). Take that back panel off and use a hair dryer to melt all the frost off. The frost is blocking air flow from the freezer section to the fresh foods section, thus poor or no cooling in the FF section. You should be able to spot where the defrost water is suppose to drain. If the water is not draining out, use a turkey baster with hot water to flush out the drain.