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iMac desktop won’t turn on but keep doing 1 long beep

Every time I turn on my iMac desktop there always 1 beep every 5 seconds but the screen remains black

Current Pro Desktops

Posted on Jan 30, 2020 1:18 PM

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Question marked as Top-ranking reply

Posted on Jan 30, 2020 1:31 PM

That is an indicator that the machine does not recognize valid RAM installed.

If this is coming from a machine you have been using it may indicate that the RAM is failing or corrupted.


About Mac startup tones. - Apple Support


How old is this Mac? Which model and year is it?

What is the installed macOS version?

Has it been serviced or hardware updated recently?

Can you access the physical RAM modules and determine if they are properly installed?

1 reply
Question marked as Top-ranking reply

Jan 30, 2020 1:31 PM in response to pj777–777

That is an indicator that the machine does not recognize valid RAM installed.

If this is coming from a machine you have been using it may indicate that the RAM is failing or corrupted.


About Mac startup tones. - Apple Support


How old is this Mac? Which model and year is it?

What is the installed macOS version?

Has it been serviced or hardware updated recently?

Can you access the physical RAM modules and determine if they are properly installed?

iMac desktop won’t turn on but keep doing 1 long beep

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