Maybe your Ethernet (Internet) cable is broken. The first sign that it may be broken is if the router's Ethernet port light (over the port where your Internet cable is plugged in) is not blinking.
Check the Ethernet port - do the little lights blink if you plugged it in?
If the lights don't blink and the internet connection keeps dropping or there is no internet connection at all, there could be several causes, however the most common one is a damaged Ethernet cable.
You can check and fix this by trying a different cable (e.g. ask friends to lend you one, or ask your ISP to send you a new one). If it is the main Ethernet cable, which connects you to your ISP's network, report the problem to them and they will replace it and your Internet connection will be restored.
Maybe you don't have an internet access because of an unplugged Ethernet cable. Ensure that all cables (from modem to wall, from modem to router or computer, from router to computer, etc.) are properly plugged in and are not loose, which is a vital precondition for a stable Internet connection and a good resolution to the "computer will not connect to internet" issue.
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