Steering wheel problem

I have a 99 jeep grand cherokee. Started car up and there is a shrieking loud noise. the car worked fine when i drove it yesterday. the steering wheel will not move. i looked under the hood and the steering wheel fluid is completely drained. do i just need fluid? what is the shrieking noise?? It’s sunday so i’m unable to contact dealership or get the fluid that i was told i can only buy from dealership.

There’s a leak in the power steering system. Add power steering fluid to the reservior which can be obtained from any auto parts store, and start the engine and then look under the front of the vehicle to see if you can determine where the leak is located.

Tester