MacBook failed to identify wireless network

Hello! I just have a question regarding MacBook Pro’s connectivity to wireless network. My sister’s boyfriend got himself a MacBook Pro for almost $4,000 and now he is having trouble connecting to his Time Capsule. It can connect to a network but when he tries the browser, the pages would not load. I am a Windows user but I’m using a Mac right now and mine was able to connect to the network and surf the Internet just fine. Can you tell me what could be possibly wrong with the other MacBook Pro? I would appreciate it a lot. Thank you.
