CHUWI COREBOX I7 WILL NOT POWER ON

All,
I have been using my Corebox I7 for about 6 months now. Today, it quit on me. I was working on it and it just went dead. I tried plugging the power to no avail. I also used a battery charger for a Corebox I5 in addition to trying a brand new charger in the store. It won’t power on.
Any ideas as to what could be done? Is there a technical support here in the US?
Thanks