![]() ![]() one long tone when you hold the power button – EFI ROM update is in progress (Macs before 2012).three long, three short, and three long tones (the inverse of Morse SOS) – EFI ROM is corrupt and is being recovered.three tones followed by a 5 second pause, repeating – installed RAM has failed initial testing.a single tone repeated every 5 seconds – no RAM has been detected.normal startup chime – memory and ROM appear good, normal startup will continue.On Intel-based models prior to the MacBook Pro 2016, the following sounds are possible: Until October 2016, Macs made sounds when starting up, to indicate their health or serious problems. ![]()
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