Here is a post showing of how mine is wired up without the jumper: Reach + RFD900 radios. If they don’t power up without the jumper, then something must be wrong.
I seem to recall having trouble when using the jumper without the FTDI USB cable, so I have been removing the jumper when connected to Reach. I don’t know if it will help, but I think you should try it this way again.
The only other thing I did was reflash the firmare on the radios.