If the vacuum's motor doesn't make a noise when you turn the machine to the carpet setting, this means that most likely you vacuumed up something into the brushes that got stuck, and caught the reset switch to trip. Recline the handle down to the floor, and look at the top part of the agitator brush housing (the head of the vacuum that is on the floor) for a red colored pin. Push this pin down with your finger, and try the vacuum again.
If the lower motor however DOES come on, but the brushes don't spin, this is a clear sign that your agitator belt either fell off, or broke. If you remove the 5 screws on the bottom of the power brush, and separate the black lower housing from the top agitator housing, you can access the belt and brush.
Here's a link to the belt used on your vacuum cleaner, which is actually made by Electrolux for ProTeam:
http://www.amazon.com/Electrolux-Power-Brush-Geared-Uprights/dp/B0017PSHDO/ref=sr_1_1?ie=UTF8&m=A13YM4FUDXTJG6&s=generic&qid=1273709439&sr=1-1
I hope this was able to answer your question. If for some reason these two solutions didn't work, please just reply to the repair by using the comment box, and I'll be more then happy to answer any follow up questions.
If this was helpful to you, please be so kind and rate my repair, or leave feedback for me. This is really appreciated by the Fixya community.
Thanks so much!
Chris Jones
GoVacuum.com