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Hearing one long tone while holding down the power button is another indicator of something going on, but it shouldn’t worry you. Apple notes this will only occur on Macs manufactured before 2012, but it indicates an EFI ROM update being in progress. When a single long startup tone is heard while the power button is pressed

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You should follow the same precautions mentioned in the above scenario to prevent damage to your computer’s internal hardware.įor Mac models where the RAM is soldered to the logic board, there is little you can do and you’ll probably have to go schedule a Genius Bar appointment at your local Apple Store to get the problem looked at and dealt with.

Ensure that the RAM module is pressed into the slot all the way and that the retaining clips are holding the module tightly in place. Once again, you can investigate by opening your Mac on models where the RAM module(s) can be removed and replaced, removing the RAM, and reseating it in the proper RAM slot(s). This can happen when the RAM module is not seated properly or a problem with the connection between the RAM and the logic board is present. If you hear 3 successive tones followed by a 5 second pause repeatedly, this is another sign there is a problem with your Mac.Īpple says this is also a problem with your computer’s RAM, and it occurs whenever your RAM doesn’t pass the system’s data integrity check. When the startup tone occurs three times in succession every five seconds The startup tone will repeat every five seconds repeatedly until RAM is “installed” or “recognized” in the computer. This error will have to be addressed as soon as possible because a Mac cannot turn on without memory. Your Mac should also be powered off completely and the battery unplugged from the logic board whenever handling your Mac’s hardware. After doing so, you can try to restart the computer again.įor the protection of your computer, you should use an anti-static wristband whenever doing anything with your Mac’s internal hardware so to prevent electrostatic discharge from ruining the delicate electronic components on your logic board. Some Macs still use removable RAM modules and you can remove them and reseat them. If you have the skills necessary, you can open your Mac to investigate whether or not the RAM has become unseated, but on many newer Mac models, RAM is soldered into the logic board and can’t be removed. This may occur if the RAM module(s) has been removed from your computer, has become unseated in the RAM slot, or a connection on your logic board is bad.

Some examples of issues where the startup tone may not be consistent with these expectations include: When the startup tone sounds once every five secondsĪpple says this will happen when the computer believes there is no RAM (random access memory) installed.

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Additionally, if you hear a sequence of startup tone rather than hearing it just once, you may also have some underlying issues that need to be looked at.Īpple notes in a support document that it’s normal to hear a single audible tone each time your Mac is turned on, but if you hear it more than once, it’s indicative of a hardware or software problem that needs immediate attention. If you don’t hear it, and your volume isn’t turned all the way down, you might have a reason to be concerned.

This is known as the POST (Power On Self Test) and the single startup tone before each boot up means it passed the test. Despite the evolution over the years, the macOS startup tone remains a critical part of the boot up process to let you know that your Mac passed its boot up tests and that everything appears to be A-OK.

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