Should you need to restore the EFi ROM on certail Mac computers produced before 2008, you'll need to use a recovery CD to restore the EFI ROM. If you hear another tone it can indicate problems with your computer.ġ tone, repeating every 5 seconds: This indicates no RAM is installed.ģ successive tones, a 5 second pause (repeating): This indicates RAM does not pass a data intregrity check.ġ long tone while holding down the power button: Indicates an EFI ROM update is in progress on a computer manufactured before 2012.ģ long tones, 3 short tones, 3 long tones: Indicates EFI ROM corruption is detected and the computer is in EFI ROM recovery mode. Your Mac should produce the familiar single tone on start up. Mac computers can produce several sounds when starting up. Learn about the different sounds your computer makes when it starts up and what they mean. These two tone combinations are clearly not the same. I could NOT locate any Apple reference to "3 short beeps, 3 long beeps, 3 short beeps".
Here is a note from the Apple website mentioning specifically about the "3 long beeps, 3 short beeps, 3 long beeps" combo beep tone.
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