Cold water valve to shower is on. Fixture is about 1 year old.

Does the cold water pipe run near an outside wall and the temperature outside is very cold. It may be frozen if it happened over night. I know is got below zero in the North Eastern US.

Thanks, that was it. Lost heat in the house for 12 hours, got down to 52 degrees. The pipes don't travel along an exterior wall but when I removed the section of wall where the pipe travels, it sure was cold. Must have an air leak, going to have to check it out. Fortunately, the pipe didn't burst so all is well. Thanks aggain!