Have you tried uninstalling the cable within Device Manager, rebooting, then re-installing? If there was any damage during your attempt, then it most likely would have just shorted out your board (spindles and head should still be okay). Try connecting the drive back up to your PSU, then power on the PC. If it is still good, you should be able to hear the drive 'boot up' and start clicking like the PC is starting up. Of course, you won't see it in your BIOS, but just the fact that the board is still able to spin up the drive should (hopefully) be proof enough that your drive and the PCB is still intact. Keep trying and see if you can get the cable working again.