![]() ![]() It is lower in tone than a beep and sounds more like a warning alert or alarm of some sort. I call the noise an "alarm" because it is not really a beep. It has happened while I am actively using the computer as well as when I have stepped away though I do not believe it has happened while in sleep mode. It has happened with different power adaptors connected. It has happened at multiple locations with different external monitors, USB, and bluetooth devices connected. ![]() I have noted no patterns in what precedes the noise. The frequency is not predictable occurrences may be separated by as little as 5 minutes or as much as several weeks. I have noted no issues before, during, or after the noise. When your Mac finishes starting up, you might want to open System Preferences and adjust any settings that were reset, such as sound volume, display resolution, startup disk selection, or time zone.Issue: randomly makes a three-pulse "alarm" noise (If you have a Mac that plays a startup sound when you turn it on, you can release the keys after the second startup sound.) Keep holding the keys for about 20 seconds, during which your Mac might appear to restart. Shut down your Mac, then turn it on and immediately hold down these four keys together: Option, Command, P, and R. The steps for resetting PRAM are the same as the steps for resetting NVRAM. Older Mac computers store similar information in PRAM (Parameter RAM) instead of NVRAM. For example, if your Mac starts up from a disk other than the one selected in Startup Disk preferences, or a question mark icon briefly appears before your Mac starts up, you might need to reset NVRAM. If you experience issues related to these settings or others, resetting NVRAM might help. The settings stored in NVRAM depend on your Mac and the devices you're using with your Mac. Settings that can be stored in NVRAM include sound volume, display resolution, startup-disk selection, time zone, and recent kernel panic information. NVRAM (nonvolatile random-access memory) is a small amount of memory that your Mac uses to store certain settings and access them quickly. If you experience issues related to settings stored in NVRAM, resetting NVRAM might help. You might need to take it into a Apple Store. Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length. The LED will repeat the sequence after approximately a 5-second pause. In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. *The only exception is MacBook Air (13-inch, 2017), which does have a startup chime.Ĥ beeps = no good boot images in the boot ROM (and/or bad sys config block) When recovery is complete, your Mac restarts. Don't disturb your Mac while the ROM recovery takes place. Newer computers automatically recover from a corrupted ROM when this occurs, a progress bar appears on the screen during ROM recovery mode. Three long tones, three short tones, three long tones: EFI ROM corruption is detected, and your Mac is in EFI ROM recovery mode.This applies to Mac computers from before 2012. One long tone while you hold down the power button: An EFI ROM update is in progress.If the issue continues, contact Apple Support. If you recently replaced or upgraded your computer's RAM, check to see if it was installed properly. Three successive tones, then a five-second pause (repeating): RAM doesn't pass a data integrity check.One tone, repeating every five seconds: No RAM is installed.If there's an issue with your Mac, it might make one of these tones when it starts up: ![]()
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