The noise you hear may be the motor running, The linkage could have came loose from the motor. Turn them on and touch the motor to see if you can feel it running then turn it off and grab one of the wiper arms and see if you can move it up the windshield if so the linkage is off. Repair as needed.
On thoose , the noise is the motor in a bind. If it hasnt done it long, you can shake the wiper arm and it will take off and work, as it gets more advanced you will need to raise the hood and bump the motor. Quickest repair is to Rain x the winshield and go with that
It doesn't seem like it would be all that hard to make windshield wipers that work in this day and age, but GM can't build a windshield wiper that works to save their soul. Sooner or later, they won't park in the right place. When that happens (no if, when), pull the cover off the motor and clean the contacts. It's happened to our '89, '95, '97, & 2000 vehicles. At least on the newer vehicles, you don't have to remove the wiper motor. You can fix it while still installed on the vehicle.