I can help, but I need a little more info. What kind of boiler do you have, and is it gas, oil, or electric heated, and do you have an air seperator with an expansion tank on it. It basically sounds like you are not moving water through the system. The only to causes for this would be a bad circulator pump, or it is simply air locked. I would check out the circulator pump first. It will most likely be attached to the boiler, and will be in line on the main pipe coming out of the boiler. It is driven by electric, so check out the wiring, and electric supply going to it. There are many brands of these pumps out there. The most common are Taco, Garfundos, and Bell & Gossit. If the pump is pumping, then I would find the highest point of the system and bleed it from there. This can sometimes be a timely undertaking. Just because you are not getting any air out immediately, doesn't mean it isn't there. A good rule of thumb is to take out a gallon of water. If you don't get any air then, your probably good to go. Also remember to make sure your supply water valve is open to put that water back in. Let me know how you do...Rob