I have created a car with 4 motors, 2 motor controllers and 7,5v battery pack and Fez Panda II. All pieces are connected and when I run my project with visual studio USB connected (side by side with battery), everything works ok. When I remove the USB and run the project onchip with battery, behavior is not the same. The wheels just run on one direction. I'm noob with electronics (not with programming) but I can't figure out the problem. I thought that this might be ground problem because it seems that the "high" digital IO does nothing. But still the same bahavior. I have also erased the board with MFDeploy to be sure that there is latest program on chip but still same results. I'm confused ::). Any ideas? Remember that I'm a noob so this might be really simple