PlayStation 5 Pro has no sound or headset audio problems

The PS5 Pro is a 2 TB console with Wi-Fi 7, advanced ray tracing and PlayStation Spectral Super Resolution, and when it has no sound the faults are the same ones as on other PS5 models plus the fact that a Pro is often connected to a higher-end TV, soundbar or receiver chain. Start with Settings, Sound, Audio Output, and choose the right device; then look at Audio Format (Priority), where Dolby Atmos and Linear PCM can behave differently on a soundbar. Sony's own page on 3D Audio for TV speakers describes the TV sound mode you must pick. If the picture works but there is no sound, suspect the HDMI ARC or eARC chain between the console, the TV and the soundbar:

power cycle each in turn, try the console directly in the soundbar, or test on another HDMI input. A headset connected to the controller takes the sound from the TV. For crackle or dropouts in games with spatial sound, turn 3D Audio off for the device. A Pro that loses sound only when 4K 120 Hz is on suggests the HDMI chain, not the audio setting. A final check is the Pro's own tone test: Settings, Sound, Audio Output, Test Speakers or Headphones plays a tone and shows whether the console's output works at all, which separates the Pro from the TV or soundbar in one minute. If the test plays through the TV when the game does not, the issue is the game's audio settings.