No water coming out of shower in master bath

I had a similar problem. Turned out to be simple to fix. Unscrew the shower head to see if water flows. Mine had a piece of solder stuck in it.

Judy,
Depending on the the architect there may be shutoff valves located in a wall with an an access panel covering them as the past owner may not have used the appliance often. Assuming you have owned this unit for some time and it suddenly quit working you may have a defective stem on a single handle unit. Their are also some valves that have shutoff screws located beneath the cover plate which may also be the problem. If you can provide more info such as how long you have had the unit, when it stopped working, and type of valve and model I may be able to assist you better. Lok forward from hearing from you and thanks for using Fix Ya.
Jim