I capped three of my sprinkler heads so that I could extend my concrete patio on each side. After this was done, I lost water pressure in my house. It seemed that I had air in the lines or something. I got that working again but then noticed my sprinklers weren't working. When I go to turn the heads on, I hear a noise coming from the main water line for the house but that's it. No heads pop up on any of the zones. The system is only a year and a half old. I can't imagine that it's the wiring or anything like that. It's defintely something to do with what I did. PLEASE HELP!!!!