[Alan Anderson]

All of the power LEDs are bright, so the Digital Sidecar appears to be powered correctly. That's good.

I can't tell from a still picture whether the small RSL LED is blinking. It looks off in the photo. Is it staying off?

The big clue in the picture is that there are Relay LEDs lit. Was the robot enabled when this photo was taken? If those outputs are active but the robot is disabled, you probably have a broken Digital Sidecar. (It is also possible that the 37-pin cable from the DIO module in the cRIO is either faulty or not properly connected, but I wouldn't expect that to result in Relay outputs being active when the robot is disabled.)