Fridge not cooling compressor works intermitently. the fridge coils are not frosted over inside

Question

the fridge coils are not frosted over inside the freezer compartment niether compartment is cool. the compressor seems to want to start but runs for maybe 5 secs. when i first noticed the compressor was warm to the touch. i have since unplug the fridge. i lost all the food, when we got home everything had defrosted an all the ice melted all over the floor!!!! Please help. Could this be the compressor relay??High pitch noise started coming from the
back it lasts for a couple of minutes then clicks off does this every 20 minutes or so.