So glad I ran across this posting. I was installing my Color DMD into a Tommy last night. I noted the instructions were incomplete [step 9 and hooking up power and the ribbons are missing], so I went on line to confirm my best guesses. Ran across this and so glad I did. It is real easy to install the 5v plug backward if you are not careful. I had it on backward. I had not fired it up yet, but I came close. This thread made me focus on the hook up, so thanks! Ended up working like a charm and I'm up and running.