Do you hear any thing running under it or in it?
Is there a fan running under it?
About how old is it?
If the nothing at all is running the cold control is bad. Some times if you tap the temp knob it will start again. The part# XXXXX XXXXX You can go to Marcone.com or call them(NNN) NNN-NNNN It is an easy repair. Unplug the unit and remove toe plate and the back panel. Two screws secure the control its self and two wires. Replace the sensing tub and remount the control. Before putting the toe plate back on clean out the dust on the coils. This will keep it running cool. Test the temp for 24 hours before putting the wine back in.