Okay ive got a motorola 4200 cable modem from comcast, and the only way it works is if i use the usb port to connect it to my computer, but now ive got a laptop, but i cant seem to setup my wireless router because all it has is Cat 5 ports (ethernet), unless there are wireless routers with usb, plz list them, or plz help
Get a new modem that has ethernet.
the modem has ethernet but when i plug it in, it doesn work, idk whats wrong....
It'll either be the ethernet card, or the modem. An ethernet card in particular shouldn't cost much. You can either test the modem with a different card or computer - perhaps see if the modem works directly with your laptop over ethernet. If the modem doesn't work, get a new one. If it does, get a new ethernet card.
You might want to check silly things like ensuring the ethernet card has a driver installed, make sure it's enabled and make sure you're using the right type of cable.
its the modem, i made a LAN with my laptop and it connected,
Make sure it's not the network cable you're try to use that's causing the problem.