The sound signals that the diagnostic tests the computer performs at startup have been passed. This is the point where you'll hear the chime if your Mac is from early 2016 or earlier. When you power on a Mac, it performs a power-on self-test or POST and BootROM test. The launch of the MacBook Pro with Touch Bar and the introduction of the automatic boot feature marked the end of this startup noise for all new Macs except for the 13-inch MacBook Air of 2017. This short sound, as we know it, was composed by Jim Reekes and first played on the 1993 iMac G3 and became the iconic noise of a Mac computer booting up, regardless of the computer line – desktop or portable – until the fall of 2016. One of the most notable features to vanish with the launch of late 2016 Macs was the startup chime.
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