Keurig b100

It sounds like one of two things happened when you disassembled the unit. Either the hose that controls the mechanism for the piercing arm (the part that puts the holes in the k-cup) became disconnected or pinched, causing the water to pour out over/around the k-cup. Or the k-cup holder is clogged or not seated correctly, which would cause the same problem. As for the little button you may have pushed, that can't cause the problem you're experiencing, so don't worry about that. Good luck, let me know if need more help. Erik