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Have you tried changing the video output settings on the PS3? It may just be on a setting that the TV does not support. For instance, if the poutput setting is 1080P, and the TV only supports up to 1080i, you would get a "not supported" signal. Hook the ps3 to a tv that it works on...turn it on, go to settings- display settings-output settings- select HDMI as the connector type- if it asks for 3D tv size...select the size- now you need to set the resolution...select all resolutions that the TV supports, since it is a dynex...it is likely a 720p TV. So I would start by selecting only 720p, and then hook the system to the Dynex TV and see if it works now. If it works, you can go back in and attempt to select 1080i or 1080p to see if they work... but again, being a Dynex, it is probably only a 720p TV... The PS3 is likely trying to output a 1080i or 1080p signal...which that TV doesn't support.
If the console turns on fine and you can still hear the PS sounds, you might need to reset the console.
Press and hold the Power button until the console beeps a few times and restarts, when it does it should ask you about the video settings to use and you should have the choice to choose what video cables to use.
Hope that helps.