@rickymiester I think you can try turning off the DX7s completely (with the main power switch at the back), then unplug all the cables. Wait a few minutes, replug everything, switch on, try again.
I use Mac. I once had a situation similar to yours when I restarted my computer. The USB portion became unresponsive (my mac couldn't detect it) while optical worked fine. Switch on / off from the front, factory reset - all couldn't solve the issue.
I finally figured out that I had to turn off the whole thing, unplug the USB cable, replug again, to solve the problem.
I don't know why it behaves that way. Maybe design fault? Or some sort of circuit protection was triggered? The EE here probably will know
I use Mac. I once had a situation similar to yours when I restarted my computer. The USB portion became unresponsive (my mac couldn't detect it) while optical worked fine. Switch on / off from the front, factory reset - all couldn't solve the issue.
I finally figured out that I had to turn off the whole thing, unplug the USB cable, replug again, to solve the problem.
I don't know why it behaves that way. Maybe design fault? Or some sort of circuit protection was triggered? The EE here probably will know