![]() 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. 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. Various adapters may be required and can be purchased at Abt.com. 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. How to hook your Mac computer up to an external TV or monitor using HDMI. If it displays The device is working properly. ![]() Under properties, look for Device Status. If you see the HDMI port right, click it and press Properties. Look, if an HDMI port is displayed, there. ![]() Expand the tab by clicking on the arrow symbol. 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. In Device Manager, locate the tab Display Adapters. 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. Also enable HDMI Ultra HD Color 4k Mode Plug in cable matters adapter to a USB C port that supports DP on your Windows PC.
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