I'm sorry about the issue. You do not need to connect the Linksys Range Extender to the computer with a cable in order to set it up. You can set it up via wireless connection. Your computer is a desktop and it is wireless right?Please try the following:- First, please check at the back/bottom of your ATT NVG510 wireless modem for your wi-fi/wireless password/key/passphrase, or you can check with the following steps:- Click on the network/wireless icon at the bottom right of the screen, then click on Open Network and Sharing Center.(Or click on Start, Control Panel, Network and Internet, Network and Sharing Center.)Then click on Manage wireless networks on the left.Then click your wireless network name.Then right-click on your wireless network name and click on Properties.Then click on the Security tab.Then select the box at Show characters.Then you will see the Network security key above it, that is your Wi-Fi / wireless password. (It is case-sensitive.)- Now to set up the range extender:
- If needed, please click on the website below for full instructions / illustrations:
Note: Use the "Wireless setup" option (not the "Wired setup" option.)
Please reply at the box below to continue troubleshooting. Thank you.