Toshiba TV fails to recognize HDMI input

Are you talking about video as in a DVD player or a streaming device? Depending on your remote, there should be a button labeled "TV/Video", "Source", or "Input". You press that button multiple times to go through the options. Now, your TV may not actually have an input labled "Video". You will probably have choices of different kinds of inputs labeled "TV" or "Antenna", "Cable", or types of ports, such as HDMI1, HDMI2, HDMI3. As you press the "Source" button to go through the sources just pause a few seconds (or you may have to press OK or Select) to watch each HDMI port to see which one your DVD is connected to. I hope this helps. Sorry, but there are many possible variations from TV to TV and different remotes.

Check your power cord and plug for damage, do a wiggle test with DVD plugged in and see if it comes on while moving and bending wire plug. press the helpful button

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did you change the input source on the TV. What HDMI input did you plug into HDMI1 HDMI2 HDMI3 ? The input source has to match the port you put the hdmi cable into on the TV.
If no HDMI output on your media player use an adapter RCA to HDMI adapter. Here is an example of such a device
http://www.simplywholesale.com.au/catalog/product/view/id/2312/s/mini-rca-to-hdmi-converter-adaptor/?fee=1&fep=2312&gclid=CJzqubrhhsUCFZGWvQodjEoAZQ

Your problem is in the streaming player. It is not keeping up and when an HDMI loses connection it will not auto find it again. To verify this take the Panasonic out of the loop and see if this fixes it. I love HDMI but it is touchy

make sure to set the input source of your tv to the right input. if you're using hdmi cable to connect the roku to tv, set the input source of the tv to hdmi as well.

try to swap the ends of the hdmi cable. turn off roku and tv as well.

Your TV has only A/V inputs. Red and White is to connect the audio outs of the streaming media, and Yellow for video. But here, your streaming media player have only HDMI output. That is, it is compactable only to TVs, which have digital inputs, where your TV has not. A converter [HDMI to A/V] in between the two devices will do it to work. There is no other chance.

Hello
You have to buy one converter box. Your TV does not accept or process HDMI signals.

There should be a button on your remote denoting "Input." If you connect the DVD player to the TV on "video input 1" then push the input button on the remote or TV itself until the DVD appears on your TV (which will be Video 1). Some TVs must have the component (in your case) the "DVD" player connected to the TV before the TV will recognize it. Make sure the DVD is powered up and then push the input button until the DVD player appears on the TV. Depending on your TV inputs, there may be multiple inputs like, Video, Component, DVI, or HDMI. The above are listed in the respective order of "quality." HDMI being the best. Whatever input you hook the DVD player up to on the TV will be the "input" you will look for when pressing the input button. Hope this helps.

It souunds like te TV is having problems with the streaming data being applied Most plasmas with DVI connections were actually designed for PC type input signals  Unfortunately the TV's input may not be able to stand up to the stream of signal the DVD or cable box wants to display. You can try and lower the output of both devices to 720P Good luck to you