Just recently bought a house... installed a new shower head in the master bath. Shower head made whistling noises for about a week whenever I used it. Then got into the shower this morning, turned on the tub, water was fine, turned the diverter knob, and suddenly heard pipes rattling in the wall, and then no water came out of the shower. Took off the shower head, still nothing.

Tub has a 3 knob system, the hot knob, cold knob, and diverter. I am hoping that the diverter is just bad. Any ideas on where to begin with this one?