I just loaded the 4.2 sketch to the teensy board, it seemed to have concluded successfully. I opened the AR4 application, and confirmed the port the Teensy was on, and got "System Ready" in green. I thought all was good, so I connected the 6 motor leads, and the 3 ethernet cables, and proceeded to power the enclosure up. The drives power up with green lights, the robot is locked, so I assume motors are working correctly, but I have no control of anything. I also notice the Teensy light is a very dim orange. I powered everything down, pulled the Teensy out of the breakout board, and reloaded the script as I thought it hadn't loaded correctly the last time. That seems to reload okay, but when the Teensy is reinstalled in the breakout board, and the usb is connected to the controlling pc, it lights up with a dim orange light, and nothing moves. I have retraced my wiring and all seems correct, ...I really took my time with each connection so as to avoid issues at this point. Can anyone tell me how to tell if I've got a defective Teensy board, or, a corrupt script load? Thanks in advance for any help!