A connectivity issue with your AT&T U-Verse high-speed Internet service may not require drastic steps, as troubleshooting the gateway though power cycling can correct common hiccups in the service. A power cycle of both the computer and the U-Verse gateway refreshes the modem's settings and connection, which causes the gateway to re-establish a connection with AT&T. If the connectivity problem continues after a power cycle, contact the AT&T Technical Support line for professional assistance.
Click the Start (Windows orb) menu button on the desktop and click "Shut Down."
Remove the power cable located on the back of the AT&T U-Verse gateway. All of the router's lights are off when the power cable is removed from the gateway.
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Leave the power cable disconnected from the gateway for 10 seconds, then reinsert it into the gateway's power port. Wait until the all the lights on the gateway are solid or blinking, which can take up to two minutes.
Power on the computer and launch your Internet browser to test the connection.