Hello & Welcome to Just Answer,
Sorry to hear of the issue you are having with your device.
To help you with this issue, may I ask:
1) The AGE of the device?
2) WHEN this issue first began?
3) Were you able to SUCCESSFULLY install and run Garmin Express - so that it can see your device?
I see it has been a few days and I just wanted to follow up to see if you have any more questions concerning this issue or if the issue was resolved.
I look forward to any further questions or results that you may have.
Thanks, ***** *****--. .-(im)