Turning off Power-On "Chime" during start-up

Hello fellow Mac users,
I need advice on how to temporarily and/or permanently turn off the
Power-On/Restart "Chime" during start-up on iMac (with wireless MAC keyboard).
I tried holding down the 'mute' button during start-up until Apple symbol shows up and that did not work.
I also tried 'muting' volume before restart and that also did not work.
My external speakers are shut off but the Chime sound still comes from the iMac speakers.
Thanks,
Edwardson

Welcome to the Apple Discussions!
Some folks use Statrtup Sound.
If you completely silence your Mac you remove its form of communicating issues to you during startup. The chime alerts you that the Mac has passed the POST, Power On Self Test and has found usable RAM. When it fails to do so it may sound other tones during startup to alert you to what is wrong.

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Turning off Power-On "Chime" during start-up

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