If your device screen is blank, try tapping the Mode button on the device to wake it up. We all need a little nudge from time to time.
If this does not work, try turning it on by following the instructions in: How do I turn on my Delta device?
If this does not work, it may be that the battery is depleted, in which case try charging the device following instructions in: How do I charge my Delta device?
If none of the above is doing the trick, then please reach out to our team here and include the email address linked to your HeadUp account as well as a screenshot of the error message. We'll get to the bottom of it!