I tried severial times to get it to come on, I did try holding the left button down for severial seconds.Trying to run off aircraft battery or internal battery?
Aircraft battery, no internal battery
What is your aircraft system voltage (at the Dynon if you have diodes in the system)?
12 volts, I have 12.3 volts at the connector
Does it come on if you kill all power to it and then turn it on? You do need to hold the button for at least 2 seconds to get it to turn on if manually turned off.
If you haven't already, sounds like you need to contact us for repair of this unit.