make sure it's not something like the thermostat just being turned down/off. if that's not it, then i would refer to a warranty or something to see if it's covered. a minifridge is a simple device; a fancy-looking cooler with a thermostat and a compressor. if it is not something simple, then it's most likely your compressor. let me remind you that compressors work with compressed coolant gasses, so you definitely don't want mess with that.