This kind of problems may raise from many different reasons and because of that you should start by narrowing possibilities down.
- Can you `ping` your router by its `ip` address?
- Can you `ping` other LAN devices using its `ip` address?
- Can you `ping 188.8.131.52` (Google DNS)
If you got responses
from any of above ping commands then you have some kind of connection to router. 1. Connection to router is working. 2. Routing to LAN works well. 3. Routing and connection to internet is working well.
If this (respond to ping, no ingernet) then problem most probably lies somewhere within DNS system. If you got response from router (1) but not from LAN (2) or WAN (3) then it could be routing problem. (wrong network mask, wrong gateway, etc)
If you do not get any responses
from any ping commands then go check your wiring/wifi connections. After that check your ip address configuration (from computer) and includee this information to your question. For example you could run command
ipconfig /all and copy its output to your question.