Hi Michael. Welcome to justanswer.
Have you tried connectinh it to other computer to check if the usb cable is working fine or not?
Accept the offer if you want Secure Remote Assistance
Once you click this link below(CLICK HERE)A file will automatically get downloaded. Check your download section, a file named ELSINORE.SCREENCONNECT will be present. Just open that file so that I can connect to your computer.
Press Ctrl j on your keyboard and check the first file. You need to click the blue text to download the file. Click the blue text below and check
Else you can check the Downloads folder on your computer.