It sounds like you may have a solenoid on the valve that is humming or buzzing.
You will probably need to find the valve and turn off the water supply and replace the solenoid. If you have an flow control on the valve it may be adjusted closed. If that is the case you could open the flow control. Most cheap valves don't have flow control. How do you know if the valve was cheap? You will just know!!!!!
Good Luck.