Dishwasher gurgling and not filling with water

[B]The dishwasher comes on before the door is shut. The pump makes a strange gurgling noise and no water is coming through.

Had a repair man come and unclog the machine, which he did. Next time we turned machine on - the problem above occurred. When we called he said, ‘its probably the seal’ and then told us a ridiculous cost. I am not convinced its the seal.

Help! Any ideas?
[/B]

What is the complete model number of the dishwasher? You can find it on the right side on the door.

Gene.