Try this... Check to make sure your trigger isn't locked "forward", it should be in the center position.
If that doesn't work, try a hot reboot.
Install new batteries in the AA carrier and install in machine.
Turn XLT on and let it go through boot up.
While machine is on, remove battery pack.
Wait a couple of minutes.
Reinstall battery pack and turn unit on.
This will reset all factory settings.
If that doesn't work, time to call White's for service.
Good luck.