I'm trying to connect a new dishwasher in a house we just moved into. The problem I'm having is that the quarter turn valve that was already in place on the pipe that was already there for the dishwasher (the previous owner took away the dishwasher) won't move to allow me to turn on the water after everything is connected to the new dishwasher. With nothing connected it will turn and open the valve. I tried turning off the water at the main valve, but it didn't make a difference. What could be blocking this valve from moving? It turns slightly before stopping.
It was a silly issue where the blue knob was hitting off the fitting. I ended up turning off the mains, opening the cutoff valve, connecting the dishwasher and then turning back on the mains. So far so good, but the cutoff now can't be turned off without removing the dishwasher connection first. Not ideal, but good enough for now.