If you just bought your FireHD10 and the display is already not working, it may be best to return it.
If that is not the case, have you tried using all of the USB ports on your computer (if there is more than one port)? Does the same detect/disconnect problem occur with all the ports, or just one?
Have you tried using a different USB cable to connect the tablet to the computer? The cable may be the problem.
You might also try updating your computer’s USB port drivers. This can be done in the Device Manager utility. In the Device Manager window, look for the '''Universal Serial Bus controllers''' entry. There should be some sub-entries below it. Right-click each entry and select “Update driver” from the pop-up menus.