Yes, the other controller blinks similarly it broke earlier.
I guess all the cubes are done. When I tried them with a working controller, the controller didn't boot correctly. I got light to only one led (out of 3) and blinking 'bright light'.
That's normally not good. The way to be sure is to test the cube with an ohm-meter/VOM for resistance. Check the resistance between pin 4 and ground and pin 6 and ground (on the 10 pin connector where pin 2 is the top left one and pin 10 is the top right one). If 0 ohms on pin 4 then things are complex. If 0 ohms on pin 6 the board is shot.