I have rented a few two player games for my kids i.e....Smackdown vs. RAW 2008, Monster trucks and a few others. I haven't been able to add in the 2nd controller so that they can play against each other. On the game that came with the system we are able to add in the 2nd controller and it works just fine. Can someone out there please tell me what to do to fix this problem. Thanks so much!!

Holly Sharpe