Hello,
Please ensure that you have a direct USB connection to the ActivBoard bypassing any USB extenders or boosters.
You also want to ensure that your ActivDriver and firmware are up to date. The latest version of the ActivDriver is 5.9 and the latest version of the firmware for the 587 board is 8.63. If you are still having issues please contact Technical Support via the web form on the knowledge base at www.prometheankb.com, select your region/language, Interactive Displays, Contact Us. In the Existing case field input case number: 279093 and provide the serial number of the ActivBoard.
Thanks!