While Doctor DeeJay may be right, I would suggest you spend a few minutes on the phone with Support with the fog machine powered on, cracked open and ready to "not go". There may be some additional things to check. Chances are it's a thermostat-type problem, which supports what Doctor DeeJay stated. It could also be that your heater is dead. Call Support and they'll help you rule out the problem as best as can be done over the phone.
You might also browse the [URL=http://parts.americandj.com/ProductsList.aspx?ProductLine=FOGSTORM 1200HD]Fogstorm 1200 Parts Page[/URL] as well, maybe even before calling.
The item Doctor DeeJay is referring to would be this item: Z-FS1200-THF
(Fog Machine Thermo Fuse)
Just keep in mind, things do fail from time to time. I also recommend that if you feel comfortable doing so, I do recommend doing your own repairs. This is not just to save money, but also so you become more and more comfortable with field repairs. Service Department knows I'm not trying to take money from them.