If it was your kit sidecar, e-mail
frcparts@usfirst.org.
The sidecar is one of the simpler electronic items FRC teams use. Assuming you've connected the power and DB-37 cable properly, open it up and see if anything looks blown. Here's the schematic to help:
http://www.usfirst.org/uploadedFiles...matic%20v7.pdf
If it doesn't light up at all, start at the power connector and work your way out.
Did it ever work or is this the first time you've tried?