So you have a partial Internet service, i.e. some pages partially load? That is a very different issue to NO INTERNET at all.
Have you contacted provider yet? If so what was their response.
What is the make/model of the router you are using. Steps to take are
1. Log into the web interface for the router
2. Check the connection statistics i.e. connection speed, attenuation and noise margin figures first.
Then given those figures we can take it from there.
Issue may be
1. Bad broadband connection
2. Issues at provider
3. Router configuration e.g. MTU issues
4. DNS issues, where not all website names are resolving