I must say, I never felt so 'dumb'. I recently had a problem with my dishwasher, water ran all over my kitchen floor. I couldn't figure out what the problem was, and called in a repair man.
The problem, an orange peel was stuck in the drain of the dishwasher. Easy problem to solve! If you ever run into this type of a problem, be sure to check your drain good before calling in the repair man!