Nothing is coming out of the machine

If you can't get water to dispense from either the brew head or the steam wand then you may need to force-prime the machine. Using a turkey baster or similar instrument, squeeze water up the tube while the pump is running. Once the water flows through put the tube back into the water tank and allow the boiler to fill completely. Since the machine has sat for several years it might be a good idea to get it tuned up by a professional to make sure it's ready to be used again.