First things first: check your stop tap. If you've had a new washing machine installed, for example, it's likely your stop tap was turned off to safely plumb the appliance in.
Find your stop tap (they're usually under the kitchen sink, or in the bathroom) and make sure it is fully open.
Make sure you've turned your stop tap off if you still have no water. This will prevent any flooding, if you've accidentally left a tap turned on somewhere in your home.