THIS PRODUCT HAS BEEN DISCONTINUED AND REPLACED BY THE PEARL CONTROL SYSTEM.
https://link4controls.com/link4_controllers/
Check Power Supply and see if its producing the 12vdc Step down voltage necessary for board to power on.
Check Main Rabbit Module for any imperfections, a bad rabbit can short out the board.
Check Rabbit module and make sure that it is seated correctly
NOTE: you can also carefully lift module off its seat and see if power LED lights back up.
Next check the Voltage Regulator and see if it is getting proper voltage distribution.
Please call support with your findings.