I have 2 of the 12v12 on my windows 8 system. One shows up in device manager on com 4 and the other jumps in and out from com 6. Now the one that was on com 6 will not power up.
This morning I installed the drivers and software on another computer ( win 7 pro) and the Jrk (yellow led ) flashed for a second and windows stated it had a problem with the usb connected. So I uninstalled, rebooted and reinstalled, plugged in and no flash / power to JRK. I have tried different usb ports with the same results.