Reply to Last-ditch effort to get S4 communicating AT ALL with PC's

I bought a used Traktor Kontrol S4 and I have never been able to get a PC computer to "SEE" it (I've tried 3 different PC's). I will save y'all the drama of all the things I've tried from the many articles I've read about this.

In short, I have what is apparently a common S4 problem... the dreaded blinking USB LED on the S4. Trust me, if a fix has EVER been posted, I've already tried it. So before I take measures against whom I bought it from, I want to ask a simple question:

When I plug the S4 into a USB 2.0 port, shouldn't SOMETHING change in the Device Manager?

This is my one and only question! I'm WAY past talking drivers and software.

The reason I ask this one question is that I have the luxury of having a Kontrol S2 here to do test with. If I plug the S2 into any given PC (without Traktor or any other NI software or drivers), the S2 INSTANTLY COMMUNICATES with the computer and Device Manager has a party going on:
* Under USB Controllers, a new "USB Composite Device"
* Under Other Devices it says "Traktor Kontrol S2"
... and a balloon pops up from the tray (beside the clock) saying new hardware found and tries (unsuccessfully, of course) to find a driver for it.

When I plug this S4 into any given PC (all updated Win7), Device Manager doesn't do anything! No balloons, no feedback from the PC in any way shape or form.

Starting to believe S4's USB has been messed up.
PS - the USB jack is WHITE... I've only seen ORANGE USB jacks on NI controllers.

Is there such thing as a "hard reset" for these controllers?

Please, please, please help! Thank you!