I did a quick search and found this online:
(
http://content.vexrobotics.com/docs/...al-9-25-06.pdf ).
From what I read, a "Flashing ORANGE indicator on power up" means "No PWM signal." This is probably caused by the sidecar. Since all motor controllers are not working, it is unlikely that all of them had something happen to them that would be causing this. It is more likely that the source of the pwm signal (the sidecar) which they all share in common is causing the problem. A couple things you can do to check the side car is to first look at it and see if there is anything visibly shorting or if something is plugged in backwards. Another this that could be causing this is chips. You can try to clean out the chips if you see any and try again. The signal light pattern would help identify the problem. Is the RSL blinking when you plug it in or is it a solid on or off? I ask because one of my teams sidecars went bad and the signal light would not turn on. If you don't see a problem, you can try unplugging everything from the sidecar except for one motor controller. See if it works. If not, try getting a new, unused motor controller if you have one to test the sidecar.
I hope this helps