There's an urban legend out there in the xbox community, that the cause of Phat Sidecars dying is due to overvoltage over the USB cable, killing both resistors on the top board and likely killing other parts. This overvoltage would be due to power surges, or just bad connection / grounding. -I've had one sidecar (Gen.1 from a Zephyr) Die mysteriously, and i can name about 5 people who have also had their sidecars die, totally mysteriously. The conclusion has always been that their sidecar was always plugged into USB, and have stayed connected till dying mysteriouly. The question is: Is there any truth to this myth, and if so .. do you feel safe leaving your sidecars connected to USB overnight...? - I wouldn't.