The ge profile dishwasher model PDW8280J10SS was

the ge profile dishwasher model PDW8280J10SS was purchased about 2 yrs ago. It was working fine up until Jan. 2009. It ran fine but the water stopped draining. I read were you should run the garbage disposal prior to running the dishwasher. I drained the water and did this. It worked fine for a while then the problem was back. Once again, Drained all the water, sucked it out with a turkey baister, moved the dishwasher and checked hoses etc. Once again, it worked fine for about 10-14 runs. It now does not drain no matter what we do. Help!!