My dishwasher has been behaving odd recently. First it would finish a cycle then the start light would flash continually (No pauses). Now it wont even run a cycle. I have pressed and held the start button for 5 seconds - end light comes on - press the start again - rinse light comes on - then nothing and the start light is flashing with no pause. We have tried giving thorough clean, Turned power off and on, water on and off. Is it kaput or fixable??