If none of these things solves your 'No HDMI Signal' issue, chances are there's something wrong with the cable or the devices' ports, meaning you'll need a replacement. And to do that, first, you’ll need to open the Device Manager by using a run command called devmgmt.msc, and in case, if you don’t know how to open the windows Run Commander then by pressing Windows Key + R Key at the same time, will open the run commander for you, and after that type the devmgmt. So, if your outputting device gives you manual control over its display resolution, consider setting that to auto, or picking your TV's best resolution. This is a big problem for PCs, for example, since they're usually capable of outputting video in a wider variety of resolutions than an Apple TV or Roku would be.
Most TVs are smart enough to adapt to any resolution within their capabilities, but some devices that send video to a TV can be annoying in that regard.
If neither of those solves the problem, one final, common thing to try is to check resolution settings. In many cases, the order in which these devices are powered on will dictate the success of the handshake.
This is an extremely common solution for people with HDMI sources connected to a home theater system or an audio/video receiver. So, if you turned on the display before your HDMI source, try turning both off and then powering them on in the opposite order. If that doesn't work, the next thing to consider is changing the boot sequence.
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