I have purchased two of the HD 1700's in the last two years. The latest was 2 weeks ago. I had the same problem BobbyA described. This units rocks when it works but tonight the new unit with less than 10 minutes of run time quit. The unit was half full of premium fog juice purchased at Sam Ashe and the green light on the front came on! Now I have no fog. I filled the tank almost to the top and the green light went off. Still no fog! I switched the DMX controller and still nothing. I unplugged the unit for 45 minutes, turned it back on and still nothing! I have spent over $600 on two HD-1700's and both have failed. What a disappointment to my kids that were hoping on having a good "Fog Storm" on halloween. I'll never buy another one of these machines!