My Lenovo T400 Laptop is not connecting to a new Router?

My Lenovo T400 laptop was connecting nicely tom my Belkin 54g Router! Now I have changed my Router to Dlink DIR 600L and the laptop is not connecting to it. All my other devices like Mobile, Tablet. Media streamer are connecting as easily as they were connecting to my old Router! What can be done?

Are you able to see the router when scanning? If not, the laptop's Wi-Fi card is not new enough in order to connect the 5Ghz wireless N connection. Your previous router was a 2.4Ghz wireless G network.

If you can see it, that makes it a lot more complicated as it could be a number of things.