If your system is part of a LAN, and you’re trying unsuccessfully to connect to the Internet through a router, try to connect to the Net directly from your system. If you are still not able to connect, call your ISP and get the Internet connection checked.
If you can connect to the Internet directly from your system, reconnect the router, modem (dial-up, DSL, or cable) and computer. Check if you can log on to the router. If not, check for loose cables or joints. Also check if the LED of the port on the router that your computer is connected to is lit up. If the LED does not light up, connect the cable to a different slot. If that doesn’t work, power off the router for a few minutes and then turn it back on. If no LED lights up after this, hard-reset your router. You can do this by looking for a tiny hole at the bottom of the router, inserting a pin into the hole and pressing the tiny button inside.
Remember, the router power needs to be on while hard-resetting. The router should now check if its IP address is static or dynamic, and if you are using PPPoE. If you are using the router to connect to an ISP that assigns static IP address, type in the ISP’s DNS and the address of the gateway. If PPPoE is configured, enter the username and password set by you or your ISP and click Apply. If the router still cannot find its IP address, power off the modem, router and computer. First turn on the modem, wait a minute or so, and then turn the router back on and finally the computer. If you can access the Internet now, no computer on your network should have any problems.
If you still cannot access the Net, try and find the modem’s IP address through the router’s status page, as described in the router’s manual. If you can’t see the IP address of the modem, then there is a problem with your browser settings. The browser’s security settings may be set to high-change this to medium.