Can you post the model number please.
Also have you check the child lock isnt turned on?
Depends on the model but most of them its the start button and the buzzer button.
Press them to in at the same time and hold for a few seconds.
If this is the problem it will take the lock off and start to work again.
Try that and let me know.
Ok remove the plastic cover at the bottom and you will see the condenser chamber.
Make sure the clips are locked into place as the red clip has to be locked in other wise it wont start.
Check that red clip and let me know what you find.
Nice one glad to hear it was just the clip.