New to the forums and trying to do this mod. I bought the board pre-programmed from KNJN.com with version 2.3 pre-flashed Soldered all of the connections, however I get no blinking LEDs and no video displayed on the screen (though my monitor stops showing the self check function as soon as I plug i...

Did you fix it? Make sure you have 21 and 22 going to 3 and 4 respectively. Try a lower gauge wire too