Jack,
Do you have a master valve (MV) for your system? If so, that could be faulty and be causing you to have the problem. Generally when all of the zones do not work, there is a problem with the COMMON wire in your system. If the common wire is cut or disconnected, none of your valves will operate, thus no water. Can you gain access to any of the valves to open them manually? If you can, and you get water manually, you know the problem lies within the wiring. Let us know what you come up with. Also, I know this may sound stupid, but make sure your controller is plugged in, controllers will not operate valves on battery back-up alone.
Tony Posey
Ridge Run Landscapes