The modem itself is working fine with internet and stuff if its connected to the computer directly. but when it tries to connect to router the router's modem led is orange and keep on blinking any help?

What is the model number of your router?
Bypass the router and connect the computer directly to the modem.
Make sure that your computer is able to access the Internet through the modem.
If the modem is working fine the connect the modem to the router and computer to the router.
Reset the router for 30 seconds.
Power cycle the router.
open the setup page of the router using 192.168.1.1.
Try to setup linksys router.

Here are some troubleshooting steps that you can do so you can isolate whether the problem is with the router , the modem or your pc.
1. Disable / enable the wireless connectivity in your laptop.2. Restart the laptop. Then check if it is working. If not, go to the next step.
3. Restart your modem and router by unplugging the power cord on the back of the devices. Wait for the devices to load, then check if it is working. If not, proceed to the next step.
4. Try connecting your laptop to the modem directly by using an ethernet cable. If it did work, the problem is with the router. Its best to call the manufacturer of your wireless router if that's the case.
5. If step 5 still didnt work when you already connected your laptop directly to the modem, the problem is with the modem itself. Call your internet service provider and they'll do troubleshooting steps on their end too.
Hope this was helpful! Have a great day.

Make sure that there is not direct connection between your desktop and modem ( USB ). If there is any USB connection from the modem to the computer then it will go on linee but the router will not be on line.
Are you trying to set up router ?
You can set up your router manually, without the CD.
Make sure that your computer is able to go online directly through the modem.
If your computer is able to go online through the modem, that means the modem is working fine.
You will need to connect the computer to the router and the modem to the router.
open the set up page of the router and change the settings of the router according to the ISP.

Click Here for more information about the routers and network

Make sure that your computer is able to go online directly through the modem.
If your computer is able to go online through the modem, that means the modem is working fine.
You will need to connect the computer to the router and the modem to the router.
open the set up page of the router and change the settings of the router according to the ISP.

Click Here for more information about the routers and network

If you connect the computer directly to the AT&T modem , it work. That means the modem is working properly.
AT&T is DSL connection type. the DSL connection works on 2 different modes. 1) DHCP 2) PPPOE.
Now you will need to connect the modem and the computer to the router. open the set up page of the rotuer.
The set up page is the page where you can change the settings of the router.
According to the type of internet connection you can change the settings of the router

Click Here for step by step by instructions

If you connect the computer directly to the modem, it works .
If that works then the modem is working.
Now connect the computer to the router and the modem to the router.
You will need to open the set up page of the router to check the settings of the router.
You can set up the router without the CD also.
It is very easy.
Click Here for step by step instructions about how to set up the router

First: Connect your computer directly to the ADSL modem. It has an Ethernet port.
If you can't get to the Internet while your computer is connected directly to the modem, then ytour router never will either. Call ISP if you can't connect to the Internet when directly conencted to the modem.
Next: Check your router wires again, The modem must be connected to the "special" port on the router. Look at the router. There is one port separated from the rest. Connect the modem to that port. Conenct to the Internet.
Still no Internet?
Reset your router by pushing a stylus (straightened-out paperclip) into the reset "hole" on the router (with router powered ON).
Push & hold for 30 seconds or until the lights do their reset dance. Connect to the INternet.

Perhaps one of your ethernet cables is bad?

When everything is connected, the "WAN" light on your router should go on, as well as the lights for whatever network connections your are using for your computer.

Obviously the cable that you used to connect your computer directly to the modem is working, so try replacing the other one.

When you connect all the devices make sure you reset them all after plugging them together. Also use a different ethernet cord and make sure your plugging the Modem into the WAN port on the router. If your still having same problem just let me know.

does the modem worked fine with ANY computer connected directly to it, or just ONE computer connected to it?

did you have to install a connection program on one of your computers when you first installed the modem?

do you have an account name and password from your internet service provider, which is required to connect?