The compressor could be gone, the niose you hear will be the internal fan unit running , this circulates the cold air arount the inside of the unit. If this unit has a timer, it will be a located in the compressor housing well in the lower rear of the , it will be separate from the compressor and will have 5 wires plugged into it, on that unit, locate a small round knob and turn it clockwise, it should start, if it does, replace the timer, if not, check the thermostat. This may need a tech to do safely as you are working with a live curcuit.
Hope that helps but without being there it quite hard to explain.
Dont forget to vote and goodluck, need more help contact me
[email protected] and if you are in Perth Australia, I can have a look at it.
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