High Definition channels will only work properly with a HD capable set top box. You may be watching a High Definition channel on a regular set top box.
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It usually takes 10 minutes or so before channel guide information starts to appear, and a few hours for the full programming guide to download to the box. When looking at the channel guide, if all you see for programming information is a message that says "To Be Announced", this is a normal message when first powering up your set top box, or after a power outage.
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If that does not correct the issue, then power cycle the set top box. If the channel does not come up after waiting a couple of minutes, then check to make sure the coax cable between the wall outlet and set top box is screwed in tight.
![mediacom bill pay red box no error mediacom bill pay red box no error](https://www.uvu.edu/concurrent/images/admissions-10.jpg)
If picture did not return, go to next step.
![mediacom bill pay red box no error mediacom bill pay red box no error](https://n.vodafone.ie/content/dam/gowingmyself/icons/svg/location-hi.png)