I plug in usb cable from computer to ups it trips out

I had a ups that was about 5 years old, it quit working. replaced with new one and trips out and the tried another new 700 watt and it trip out too. I un-plug the usb calbe and the ups works fine. How do i stop this from happening?
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More about plug cable computer trips
  1. what's the make and model?

    do you have the monitoring software installed on the PC/server you're plugging USB into?
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