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
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!