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A hybrid modem combines both your router and your modem into one housing, meaning that you only have one Internet item plugged into your DSL line. If you have a hybrid modem, you should be able to reboot your modem by rebooting your router. If your modem was delivered to you by your Internet Service Provider (ISP) and is separate of your router, skip to the next method. While you don't need to physically walk over to the modem, your computer must be connected to the modem's network in order to reboot it remotely. You can do this on both Windows computers and Mac computers. You'll need to access your router/modem page via the Internet. In the browser's address bar, type in the IP address for your router, then press ↵ Enter. This should open your router/modem page. If prompted, enter your login name and password. If you didn't set a name and password, these credentials are probably in the manual or on the bottom/back of the router/modem combination unit. Since different modem models have different page layouts, you may have to poke around in the page's settings. Try looking for the restart option in any of the following areas:  Advanced Settings Configuration Help Utilities Again, the appearance of this button will vary depending on your router, so it may say anything from Restart to Power Cycle. Clicking it will prompt the connected router/modem hybrid to restart. This can take anywhere from a few seconds to a few minutes. Once the unit finishes rebooting, your computer's Internet should reconnect.

Summary:
Make sure that you have a hybrid modem. Ensure that you're connected to the modem's network. Find your router's IP address. Open a web browser. Enter the IP address. Log into your router's page. Find the "Restart" option. Click the Restart option. Wait for your router and modem to finish rebooting.