We have found 2 possible solutions to your problem.
Before you start this troubleshooting guide you need to check one important thing:
Can you use your router's connection to access the internet?
Yes
No
Why do we ask this question?
It's important to find out if your router has an internet connection. If your router doesn't have an internet connection, you need to solve this problem first. When the problem is solved, you will most likely also be able to use your internet browser.