What type of computer are you using? Laptop or desktop? Make and model number? Operating system? What do you mean by "My Ethernet cable won't connect."? Will it not plug into a router? Or a modem? Are the plugs or jacks missing? (If you have both a modem and a router, have you tried plugging directly into the modem?) Or do you actually mean you are unable to access the internet, using a browser (which one are you using?), when the ethernet cable is plugged in? Try downloading a different browser, like the free Firefox browser, and see if it works with the different browser.
Do you also have a wireless adapter installed and running? If so, disable it for the ethernet cable to "take over".
Hope this helps and let us know more.
I need help. My Ethernet cable won't connect, I have tried a bunch of things: buying a new cable, buying a new network card and reinstalling Windows. I really need your help on this one, please