My screen says “No signal”. What can I do?
Check: Is the correct HDMI input selected? Are the cable and any adapter fully connected and powered?
Try: Connect the source directly to the screen and set it to 1080p at 60 Hz. Add any adapter or switch back one at a time.
4K at 60 Hz works, but 120 Hz does not.
Check: Do the source, TV input and every adapter or switch support 4K at 120 Hz? Is the cable suitably rated?
Try: Use the TV's correct high-bandwidth input and test directly with a certified Ultra High Speed cable.
The picture flickers or keeps disappearing.
Check: Loose connectors, cable damage or an HDMI run that is too long for the chosen format.
Try: Reseat both ends and test with a shorter rated cable. If that works, check your original cable and any intermediate device.
I have a picture but no sound.
Check: Is HDMI selected as the audio output on the source? Is the TV or receiver muted?
Try: Try plain stereo sound (PCM, Pulse-Code Modulation) to rule out unsupported surround-sound formats. If using a soundbar, also check its ARC/eARC connection and settings.
The desktop works, but streaming video stays black.
Check: The streaming service may require HDCP copy protection across the whole connection.
Try: Test the streaming device directly with the TV, then reconnect the switch, splitter or extender. All devices in the path must support the required HDCP version.
Both monitors show the same picture instead of extending my desktop.
Check: Are you using a splitter, which duplicates one video signal, or separate display outputs?
Try: Select “Extend” in your computer's display settings and use two suitable video outputs or a compatible multi-display docking station.
My soundbar isn't receiving sound through ARC or eARC.
Check: Are both cables connected to the ports marked ARC/eARC? Is the TV's audio output set to HDMI ARC/eARC?
Try: Enable the appropriate HDMI control and audio-return settings, restart both devices and test a basic audio format.
My USB-C-to-HDMI cable works with one device but not another.
Check: Does the other device support video output through USB-C (DP Alt Mode)?
Try: Connect the cable directly, test a basic 1080p output and check the device's video-output specifications.