OK, I replaced my Pre- and Post- filters in my K5 RO System for the firs time. Pretty stright forward, i thought. Shut off water, open faucet relieve pressure, take out old filters, put new filters, turn on water supply, run water to flush carbon...After changing, I still have no water flow...The blue indicator is up again, I have water in the pre-filetr ( I took them out again to see if I did something wrong...why would I not get flow? Tank has water in it..Its got to be something simple....and I do not want to call the dealer for this...Any help, please??