Sorry, not sure how I missed this earlier.
Start with the basics, is the power lead, and both ends of the HDMI lead securely attached?
If you use a different HDMI socket or TV, does it work?
Does the LED on the front of the iMX6 light up?
Are there any batteries in the infrared remote control, if so, point it at the front camera of a phone and turn on the camera app. Press some buttons on the remote, can you see the remote's LED flashing on your phone's preview of the picture?
Do other devices work if you plug them into the same a) Mains socket b) HDMI socket on your TV?
If you haven't already, you might want to e-mail us or call -
http://www.droidboxforums.com/threads/what-to-include-if-you-need-to-e-mail-us.364/