Router not registering an IP address

Unplug the modem power from the wall, then plug it back in and connect to your router.

 

Set a static IP for your computer.

 

Is your modem set up for TCP/IP correctly? Is there any bad DNS server IP's in there? Also, I know you said you have already powered them down and so on, but they sometimes have to go on in a certain order.

Power off the router. Unplug (switching the modem off isn't enough) the modem then wait a couple of minutes. Turn the router on, then plug the modem back in.

 

Try this:

Wire the computer to the router and clone its ethernet MAC address from the router control page.

 

No, you only need to wire it to copy the MAC address. You could also look in the Network System Preferences to find the Ethernet address and enter it by hand in the router page.

In one of the configuration pages of the router should be a "Clone MAC address" option with some input fields below it.

 

It is in the Setup tab. MAC Address Clone

 

If you clone the address by wiring the computer, disable wireless before configuring, or I think it might get the WiFi MAC if that's how the management connection to the router was established.

 

I had to fix my friend's modem that did this the other day. I ended up having to:

1) Unplug the modem (power and ethernet).
2) Plug into computer directly, then power on modem.
3) Wait for computer to get an IP (30 sec to 1 min), if it doesn't then power cycle the modem again.

[Note: if your computer can't get an IP from the modem after resetting it once or twice, you have a bad modem.]

4) Test internet, open a few pages, etc...
5) Unplug ethernet from computer, plug into router.
6) Power cycle both router and modem.
7) Wait a good 30 seconds.

At this point, the router could acquire an IP again.

 

Ah. I understood it was the first time you set up the router.

Although one never knows when an ISP might start blocking MAC addresses from router manufacturers.