I've seen many questions regarding the startup sound being BACK. I have a different experience.
I have a Mac Mini (Late 2014) and it always DID have a startup sound (right after pressing the power button). Unfortunately that sound is gone since I updated to Big Sur.
I checked System Preferences -> Sound. But the checkbox for "play sound on startup" is checked. I even tried unchecking and rechecking it. But to no avail. Sound works fine for other things so it's not the speaker being broken.
So how do I get the sound back?