I just received a used one and had all kinds of problems. They told me to unplug and use a safety pin or paper clip and poke in the holes in the bottom of the K-cup holder then go to the needle in the top and push it into the little holes around the needle. Ok that worked. So I filled it with vinegar. Then it would say brewing but nothing came out. Called back to Keurig. They went through more steps with me and still the same, Brewing but no water. She put me on hold and when she came back she was sending me a whole new unit. This was a large one that isn't made any more. She overnighted me a top of the line 2.0 model. Don't do it. The 2.0 will only brew the new Keurig K-cup. It has a code on the top label that the machine reads before it brews. Gave it to the kids last night. So try poking around at yours. Oh, also let the vinegar sit in the guts of the machine for 4 hours to be sure all the white lime deposits are dissolved. put it in let it start to run thru and turn it off so it sits "in" the machine for a while. Mine said to only use bottled water, not tap water. We have well water and I knew that wasn't good for it. Kids live in town.
The kids were talking about that yesterday. Said it was all over the internet because no one wants to buy the expensive cups. They still took it and gave me their old little one. Not sure why they thought I needed it but I have it. At least they thought of me. Was very impressed with K's customer service though. I even told them I had received it used and they didn't blink to replace it.
Not sure why it did that but this was in response to Misty's Mom.