3 ms·The startup sound was not from macOS, it occurred earlier in the boot process that that.by 1over137 8y agoThe startup sound was not from macOS, it occurred earlier in the boot process that that.sjm-lbm 8y agoThis may be true, but it was removed from Apple hardware as part of the macOS Sierra update.snuxoll 8y ago2015 15" MBP running Mojave, startup chime is still there.