All we are getting is a pixilated screen and no sound. Dvd's play normally

OK. This should be simple. If you are using a TV with a built in digital tuner like all the HDMI ( High Defintition Media Interface) flatscreens then you probably need to go through your set up menu on your Digital TV and select Initial Setup / Channel Input / Cable / Satellite if coming directly from a dish on 75 Ohm Coax / or Cable if coming directly from the outside 75 Ohm coax with analog signal. ( When I say DIRECTLY, I mean you are not going through any boxes and changing or passing the signal). All satellite direct connects are digital and all satellite converter boxes have multiple out puts these days. There is an HDMI output for high def and low def analogl to digital (A/D) signals coverted within the TV, sometimes there is a DVI or even a USB out put connector...and there is a 75 Ohm coaxial RF cable connection for all the old schoolers who do not have a widescreen digital TV. RF means Radio Frequency and uses Radio Frequency Channels 3 and 4 at the bottom of the RF band around 56 MHz to which any TV with an Analog Tuner can use. In the old days this is what was used for the connection to the TV from the cable boxes because our TVs did not have the capability of decoding analog pay channel signals, hence the little black boxes sold and used ONLY by cable thieves and not any of us here on fixya. For starters, let's make sure you are using your high def, dvi. or some format of digital It sounds like your TV is set up to search and code digital signals but is looking for the wrong carrier frequencies, meaning it is either looking for decoded digital satellite box signals, digital broadcast ( New Digital TV received via an Antenna). Once your TV scans for channels in the cable mode they will be memorized and available on your channel up / down keys and Favorites. (FYI t will scan for both digital and analog channels on antenna mode). Repost if you have troubles or refer to your users manual.