I just bought an old used mini fridge from neighbors that I hope to bring to college. When I first plugged it in there was a soft hum which I was okay with, but after a while there was a louder and high pitched whine. How can I fix this, or is the fridge dying?How can I fix a hum/whine in a used mini fridge?This is normal with mini fridges. be sure it is level on a flat hard surface. There is a fan in there that gathers dust and carpet and pet hair..you need to see if you can access it to clean it and be sure it is not bent - turn it off first . If you tip the refrigerator allow it to sit upright again for a few hours before replugging it in. If the compressor itself is humming ..unfortunately your sol.

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