I have connected previously.

Windows 8.1 as Administrator

All comm ports working - tested with Arduino

Turned off Antivirus

Removed all drivers and DroneCode related software I could find in Programs.

Rebooted with shutdown.exe /r /o

Installed QGroundControl

Drivers seem to install fine.

Connect PixHawk: lights and beeps

No comm port!

Tried 4 different cables (tested on other devices for power/data and they work)

I've googled and gone through everything I can find, even going back to APM drivers just to see if that would work. Uninstalled everything, re-installed QGC.

Still no joy.

Any thoughts or search phrases you can think of?

Any help appreciated!

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