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iMac is beeping and not getting started even pressing the power button

iMac beeps in every 5 second after pressing the power button. It was working fine and i just tried to login on one user and just by clicking on user it

iMac Pro

Posted on Jun 21, 2020 8:41 AM

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Question marked as Apple recommended

The following table lists the new tones and their meaning:


Tone(s) Description

1 tone, a 5-second pause, repeat No RAM installed

3 successive tones, a 5-second pause, 3 successive tones RAM does not pass data integrity check

1 long tone when holding down the power button Firmware upgrade in process. See About firmware updates for Intel-based Macs for more details.

3 long tones, 3 short tones, 3 long tones Firmware restoration from CD in process. See About the Firmware Restoration CD (Intel-based Macs) for more details.


http://support.apple.com/kb/HT2538


Older meanings...


Can you count the beeps or flashes?


1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable


In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.


Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.


http://support.apple.com/kb/HT1547

Posted on Jun 21, 2020 9:17 AM

8 replies
Question marked as Apple recommended

Jun 21, 2020 9:17 AM in response to mansurishehzad

The following table lists the new tones and their meaning:


Tone(s) Description

1 tone, a 5-second pause, repeat No RAM installed

3 successive tones, a 5-second pause, 3 successive tones RAM does not pass data integrity check

1 long tone when holding down the power button Firmware upgrade in process. See About firmware updates for Intel-based Macs for more details.

3 long tones, 3 short tones, 3 long tones Firmware restoration from CD in process. See About the Firmware Restoration CD (Intel-based Macs) for more details.


http://support.apple.com/kb/HT2538


Older meanings...


Can you count the beeps or flashes?


1 beep = no RAM installed

2 beeps = incompatible RAM types

3 beeps = no good banks

4 beeps = no good boot images in the boot ROM (and/or bad sys config block)

5 beeps = processor is not usable


In addition to the beeps, on some computers the power LED will flash a corresponding number of times plus one. The LED will repeat the sequence after approximately a 5-second pause. The tones are only played once.


Note: In this case, a flash is considered to be 1/4 second or 250 ms or greater in length.


http://support.apple.com/kb/HT1547

Jun 21, 2020 2:04 PM in response to mansurishehzad

Try unplugging the power cable for second, plug it back in and then press the Power button. If that's what it takes each time to restart you may have a power supply problem.


Try booting into Safe Mode (How to use safe mode on your Mac - Apple Support) by booting with the Shift key held down and check there to see if the problem persists.  Reboot normally and test again.

NOTE: Safe Mode boot can take up to 10 minutes as it's doing some system cache cleaning, volume verifying and directory repairing. 

Also make sure the RAM modules are securely seated in their sockets.


iMac is beeping and not getting started even pressing the power button

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