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What you are seeing is the popup info window showing your video quality or aspect ratio just changed. Apparently from what you have said you have not set up the channels yet. You must do this as the TV doesn't know what settings to apply to the channel and so is automatically changing it's resolution each time and then telling you it did so with the popup. Most commercials are 480i and programs on digital cable or digital OTA are usually 720p or better. To do the channel setup on a Dynex 55", tune in any known good TV channel and then press the menu button one time. Then use the up/down buttons to go to the bottom icon and press enter. Choose either cable or antenna from the Tuner Mode setting. Then choose Channel Scan and the TV will find all your channels. When it's all done it should have set and adjusted the channels. If you still get this popup then you might need to go into the main menu then choose the setup submenu then choose your Aspect ratio to match your TV (probably either wide or normal or auto). Go to the Dynex internet address listed on both your guides and download the manual and read it. Hope this helps.
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