We have found 3 possible solutions to your problem.
Before you start this troubleshooting guide you need to check one important thing:
Is your router turned on?
Yes
No
Why do we ask this question?
It's important to find out if your router is turned on. If you can't turn on your router, you need to solve this problem first. When the problem is solved, you will most likely also be able to establish a wireless connection to your router.