USB hub does not work!  Help

I was attempting to install a KVM switch for my G4 and G5 that required me attaching my keyboard and mouse to the usb port on the back of the monitor.
The USB hub does not work! Monitor cable has no bent pins, and works perfectly for video with all my Mac's, G4's, G5's. The problem is I have had this monitor awhile and never tried these ports so apple won't help.
Anyone have any suggestions why these ports don't work and if there is a fix?
Can any one recommend a KVM switch that supports ADC, and USB so I bypass this hub.
Thanks

Some USB 2.0 hardware works very well w/USB 3.0 & some don't.  Suggest that you contact the sound card manufacturer & ask them.  Perhaps they can recommend a work-a-round. 
Another user posted about the same problem some weeks ago regarding a sound card. 

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