Most times a garage door won’t open because a counterbalance mechanism isn’t functioning such as a broken extension or torsion spring. If an electric opener is present and no noise is noted when activated, try disconnecting the opener by pulling the emergency release and manually lifting the door. If the door moves the problem most likely is the opener. Make sure there is power to the outlet supplying the opener and if present then a service call by a trained professional is warranted. If there is a problem with the counterbalance mechanism, repair should be made by a qualified door mechanic.