I agree, check to see if the line is clogged at the sink end and at the dishwasher end. I would clear any debris away from the inside area where the water enters the drain pump. Then turn the lever for the power so it wants to drain. Listen at the drain hose or feel the drain hose to see if the pump is working.
In many dishwashers there is a screen that needs to be cleaned, I learned this one the hard way.
I'm not an appliance guy but I though that I would throw this in. Look up your unit on the web and see if you can find a parts breakdown, look for the screen/filter.
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