So you tried using a second Arduino but the same controller shield?
It could be a bad shield, bad cables, bad motors or something in Ground Control. I doubt you have three bad cables, three bad motors or some combination there of. Its most likely a bad shield or something in Ground Control (possibly fake servo mode being enabled).
Im going to tag @EastBaySource again to see if they have anything to add. Im also going to tag @Orob as he has experience with EBS boards and @bar as he created the original Ground Control.
@jonatpridesleap I hope this helps, but my quick read of the situation caught the baud rate change.
@Les, if you are using a mega, your baud rate should be 57600, not 38400. 38400 is for the M2 Due controller only. If you are using EBS shield, you need one of the newest firmware versions or EBSās version from their site. Groundcontrol talks 57600 bps, so please donāt change the firmware communication speed for the Mega. Makerverse is adjustable, so I ran one at 115200 just to see if it would and it did just fine. I dontā know the history on why they are, but they are what they are. Hopefully a communication speed adjustment will help get you going, but you will need to change it and reflash the arduino.
That did it! All Servos are responding now and GC is now providing feedback. I originally changed the baud rate because I was getting jibberish and read somewhere that it had to be set to 38400. Thank YOU ALL for your help. It is GREATLY appreciated!