I was having the same problem. I tried all of the things suggested on different sites (the paperclip thing, blowing compressed air in the hole that is spitting the water back in to the tank) nothing worked. I decided that I had nothing to lose, so I took off the plastic piece that is on the arm (the part that you lift up to put the K-cup in). To take it off I had to first open up the arm like I was putting in a k-cup and unscrew the two screws that were on the roof. I then closed the arm and unscrewed the screws that were holding the handle on. After this I had to wiggle the plastic piece that covers the arm around until it came off. I thought it would break but it didn't. When I got the plastic top off I could see the hose that takes the water from where it heats to put it through the K-cup. I couldn't figure out how to take the hose apart so I started squeezing the portion that was closest to the front, this made it spit out water. I then turned the keurig on and ran a cup through and it worked. Im guessing there was some blockage in the hose that was dislodged when I squeezed it. Hope this helps!