I have had similar problems. Suddenly, green light started to flash with no particular reason.
After some research Start light flashing denotes machine malfunction. This afternoon I started to dig and discovered, that the reason is activation of water flood prevention sensor. Sensor sits in the lowest areas of the water collection bowl in the button of the dish washer. When there is 5-8 mm of water, sensor is activated.
Water can come from condensation or from licking. So I have removed water for now and will check if there is more after some time. If so, than I'll investigate where licking comes from.
Miro
January 2010