I moved my modem and now my linksys router doesn't work?

Who is your Internet service provider at new location?

I think you should try to reset and reconfigure the router from the scratch.
Connect the computer directly to the modem and make sure that your Internet modem is working properly.
Connect the modem and computer to the router. Open the setup page of the router and change the settings of the router.
You can try this Linksys Router Setup website and I think it will help you.

Try this: Unplug EVERYTHING(related to both the router and modem). BEFORE you plug in power to anything, connect all of your ethernet. So, first ethernet goes from modem to router. Make sure they are in their proper places. Next, take another ethernet cable and attach that from modem to computer. NOW, power everything up. Google the linksys router splash page login. Im sure it'll be something like: 192.168.1.1 or 192.168.0.1 or something along those lines. From there, you should be able to set up your wireless. Once thats all good, unplug just your computer and everything should be fine. If that doesn't work, its either time for a new router or you're having wifi card issues.

DHCP and static IP are two different things. DHCP assigns IP addresses, and static Ip just means that the IP address stays the same, and is not dynamic. You probably need to reset the modem to accept what it sees as a :"new" router. Turn off both router and modem. Restart the modem first, give it a minute to boot up, then turn on the router- in that order. It should be ok now.

hi, whats the exact error?

Different ISPs require different configurations. If you have a Linksys router, such as the WRT54G, there are 2 ways on how you can configure it, either by running the Setup CD or by doing manual configuration. This particular router has its own web utility and you can access it by typing its IP addres on your web browser, ex. http://192.168.1.1. By default, it doesn’t have any username and its password is admin.

Once you’re inside the setup page, you can configure now the router for DHCP, PPPoE or STATIC IP settings. For DSL customers using a PPPoE account, some modem needs to be configured into BRIDGE MODE first and then the router will be set to PPPoE with the correct username and password (given by ISP). If your a DHCP account, modem doesn’t require any configuration. It will work with its default setting and the router would be set to DHCP. Once done, powercycle your devices to establish internet connection.

Not sure if I understand properly but your router should have a WAN port or an "Internet" port

your modem should be connected to it and your PC should be on any of the LAN port

Make sure DHCP is turned off on the modem or else you will get ip conflicts. Also make sure it is plugged into the wan port on the router

Before you can use your linksys router again, you must configure first your AT&T modem under bridge mode. If the AT&T modem is already set to you may connect the devices (modem router and PC) must be switched OFF first.
after the devices had been connected,...
1) turn ON the AT&T modem first, wait for the DSL light to stay solid
2) turn ON linksys router,wait for the lights to stay solid
3) turn ON computer,wait for your desktop screen
4) try to access Internet Explorer

Here's you can download the driver for your Linksys model:

click here...>>>>> DOWNLOAD HERE:

tnx,
-micro

I am confused, you are using 2 routers, or you using their dsl modem/router? or your original??