Help automatic gear not shifting?

I bought my son a little 90 automatic a month ago. Took it out to the trails for the first time it would not change gears. Just winding like it wanted to change gears but it would not.
Any help beside take it back to the dealer

it is a 2002 articcat 90 same as the polaris scrambler 90.

Any feedback would be great.

thanks

Sounds like the torque converter is seized on the shaft and won't slide properly.If its a 2002, take it to the dealer and get him to warranty it. If he won't, call the district rep and *****. By the way, you should have bought a HONDA.:blah