GRBLSHIELD V4 PROBLEM?

Everything was working well, motors ran, instructions followed etc. Then, I made the mistake of plugging in my Motor Power supply when everything else was plugged in. A lot of sparks between the two plugs and the problems started.
The control electronics stopped working, and the GRBLSHIELDl board had lights flashing all over the place with no motors moving.

Since then, I have replaced the GRBLSHIELD Board with a V4 board rather than the V3 board the came with the kit.

I did some testing an here is what I have found;

1 Motor Control Power supply indicates 22 DC volts and plus is attached to the correct connection on the GRBLSHIELD board. When turned on I get a blue light from the GRBLSHIELD Board. At this time nothing is plugged in to anything except the GRBLSHIELD board is plugged into its power supply. However, the Adriuno and GRBLSHIELD Board are attached to each other.

2. I am using GRLB Controller and Windows XP Home Edition

3. Adriuno and GRBLSHIELD board communicate through the USB and cable to start with when the GRBLSHIELD Board is unpowered by turning off the Emergency Stop Switch.

4. Emergency Stop switch is switching the +24v side. $ dumps the proper parameters back to the Computer. Other commands are recognized by the pair and results are sent to the computer. Now remember, the GRBLSHIELD Board is unpowered at this time.

5. When I turn on the power to the GRBLSHIELD Board, I get a blue light, but the adriuno and GRBLSHIELD Board no longer can communicate to the computer and I get an error message that says “sending to port failure”, I have to restart the computer before I can use the USB port after it has failed.

Anyone have any ideas what has failed or what is going on. Somehow the power being on on the GRBLSHIELD Board is feeding back through something to affect the USB port. But I do not have any ideas of why, or what to check. I could order a new power supply and or a new adriumo, or maybe I got a bad GRBLSHIELD Board. I just do not know what to do now.
Anyone any ideas?

Thank You, Bill Wallace, St. Louis area.