Fantom Cyclone XT Vacuum Cleaner

Here is the owners manual which goes over some troubleshooting problems.

http://www.fantom.com/fantom/manuals/Cyclone.pdf

At first I would think it was the thermal overload, which is covered in the manual. But I would guess that you have let it sit for 30 minutes to cool down and tried again and the vacuum still didn't work.
I would think you may have one of four problems.
1. Your thermal overload was tripped and is stuck and will need replaced.
2. You have a clog in your vacuum lines or the brush roller is froze, which keeps causing the thermal overload to trip.
3. Your power cord has a short, which would need replaced.
4. Your power switch is bad, which would need replaced.
Out of these 4 possible problems I would say the only one you could fix on your own would be problem #2. Make sure the vacuum is unplugged and take the brush roller off and clean it, make sure it moves free. Check your vacuum lines to make sure you do not have a clog, other wise the motor does not get air flow to cool it down causing the thermal overload to trip. As for problem 1, 3, and 4 I would suggest taking it to a repair shop.
Hope this helps, post back.