I have 5 sinks in my house and two showers. In 3 sinks and the 2 showers, when I turn the water on it will only come out on the cold setting. If I turn it left to the hot water setting nothing comes out, not a drop. In 2 of my sinks (both in the master bedroom) NO WATER at all comes out; not hot or cold! HELP!

You do not have hot water in entire house. Look at the source: Hot Water Heater. You may have popped circuit breaker (elec. w/h). Was there ANY plumbing work done in your house in recent days ?