The cold water hose is fine (checked it), but the machine will not accept cold water at all. Hot water cycle runs all the way through; warm water cycle gets stuck on rinse cycle; cold water cycle will not work at all. Took plate off back. There is a blue box where the hot and cold water intake are, which also has some electrical connections on one side. We are thinking this is a valve problem, but we have no idea what to do. Thanks for any suggestions.