First off, you might want to move this thread in the Technical Disscussion area.
What you want to do is try putting your other games in. If they're all having the same problem, chances are the lens is done.
Your best bet is to call Nintendo's repair service (They should have an 800 number on their site) and tell them about it. If you're under warranty, you may be able to get another one free of charge. if not, it might cost a little.
Hope that helps.