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You need an hd cable between your cable box and tv. They don't provide them for free. Once you plug in your hdmi cable to the tv, change its input to the hdmi port you just plugged into. The guide is updated by the cable system on their internet but over the coax. Give it time, it should come back. If not, reset the cable box by unplugging itfrom the wall power, wait 5 seconds, plug it back in. It should come back.
It sounds like either the cables are reversed, loose, or possibly bad. This is what happens when a cable connection is not "solid". Please make sure all the cables are attached securely and in the correct order, if they are you may need to replace the cable. If it still happens with a new cable, it is probably the input on your TV that has an issue.
It sounds like you dont have the right HD box. When connecting HD you will use an HDMI cable or a component cable consisting of 5 cable total 3 for video two for audio. Coax cable is not used to connect HD to your TV / Monitor.