The great majority of problems with EFI ROM corruption occur when an EFI update is interrupted. Much older PowerPC and Classic Macs are different again, and some flash the display rather than making error tones. 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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