The set-top box connected to your television delivers digital cable to the TV. If the cable box loses signal, fails to broadcast in high-definition -- despite having an HDTV and HD-compatible box -- or displays a pixelated or distorted image on some or all channels, the box might need to be reset. You can power-cycle the device as a troubleshooting method to see if the problem goes away.
Hold down the "Vol+," "Vol-" and "Info" buttons on the front of the cable box until the device shuts off.
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Unplug the cable box from its electrical outlet if the device remains on.
Wait 20 seconds and then reconnect the box to power to reboot the device. When the current time appears on the display panel, the reboot is complete.