motor shield servo not working
I just finished getting the motor shield soldered up and just trying to get a servo running (starting simple, i thought).
i am powering my UNO via usb, the sketch is uploading without error (tried both example > servo > sweep and knob).
i have the power jumper in place (as i thought the tutorial said that was fine for using a servo) and the power light lights up on both the UNO and the shield.
When i first plug the UNO in via USB the servo makes a little movement that lasts a few microseconds as if to tease me and say, i am getting power, but ha ha you can't control me.
it is taunting me.
any ideas on where to start trying to figure out what is happening.
i am using the smaller servo that came with the motor party pack (tower pro SG92R).
thanks for any help you can give.