I have a TomTom Go 910 and I had the same problem. I thought the problem was with the GO 910 but it turned out to be with the computer instead. The GO 910 seems to corrupt the USB driver files on the computer over a period of time when you connect it to your computer to update it or for whatever reason you connect to your computer. To repair the USB driver files on the computer, right click on My Computer and in the menu that opens up select Manage. In the Computer Management window that opens up select Device Manager from the left side of the Computer management window. Then in the right lower side of the window (you might have to scroll down) you will see Universal Serial Bus Controllers. Click the + sign to expand the Bus Controllers. Start at the bottom of the longer lines that you see and right click on it. In the selection that opens up left click on uninstall. Starting from first of the longest lines at the bottom, uninstall all of the USB drivers. Sometimes they will reinstall themselves before you can get them all uninstalled, but if you keep at it you will be able to get them all uninstalled and then restart your computer. When the computer restarts you will see messages that the computer has found new hardware. Then after the computer is on for a few minutes you will see messages that your new hardware is installed and ready to use. If the USB driver files were corrupted this will reinstall them with the correct drivers and you can connect your TomTom to Update it or for whatever reason. Also when you do this make sure that you don't have any USB devices connected to your computer until you are done, then you can connect your TomTom.
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