Im sorry but there is not a reset buttonm that you can push to get it running again. What you can try is unplugging the unit for a few minuits. Plug it back in and hope for the best.
Another thing you can do is pull the unit away from the wall and unplug it. Use a vacuume and clean out all the area under the unit and the grill on the back. Get all the dust and other crud out of it. Once you have done this look for a big oval shaped thing and feel it. if it is hot then you need to let it cool off. A fan will help this considerably. Once it is cooled off (slightly warm is ok) plug the unit back in. There is a internal overheat protector on most units that will reset on its own.
If the unit still doesn't work then a repair call will be needed.
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