Bill, I know it would be too simple of a fix, but on my X3 the order that you turn on the main power switch and the forward/ reverse switch make a difference if the thing will power up or not. I don't remember which one comes first I check in the morning. The first time I tried to run it after hauling it home, it acted dead and then I figured out the sequence of the switches and it worked fine.
Just a thought
I would rather have tools that I never use, than not have a tool I need.