XDJ-AZ does not power on and boot (all black)

I regularly pushed the power button but nothing happens. Power cord and socket are functional. Checked with power cord of the speakers VM-80. The quantize/wake up button does NOT flash. Black screen and no lights at all. I tried to boot like I´m conducting a firmware update by keep pressing Beatsync/Master on deck 2 then power on. No joy. Tried to hold and push deck 1 delete & tempo while powering on. Also no joy. Purchased in July 25 and worked fine so far every single day. I had to wait 6 month to get the unit and I´m now afraid to send it back.

Any ideas from your side what to try to get the controller up and running? It seems like a very deep sleep mode... Or the internal power unit is broken.