The Water Garden pumps are built with an internal power valve that is switched on/low/high when you unplug and replug it in. It seems a bit odd I know, but the internal valve it is a product of customized design of the pump for its use in the Water Garden. You should notice a distinct increase in pressure if you just unplug and plug it back in a couple of times.
If there is no power in the pump after trying this please let us know and we can send you a replacement.