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Level 1

4 points

Startup problems

Older Macbook Pro. Three beeps repeating. Mac fails to startup.

MacBook Pro 15", macOS 10.13

Posted on Dec 8, 2019 12:53 PM

Top-ranking reply

Community+ 2024

Level 10

189,192 points

Posted on Dec 8, 2019 1:02 PM

This would be RAM problem.

You do not say what exact Mac /model /year /size /retina /touchbar is this

what exact macOS you are currently running?

For example 2012 MBP...

Try re-seating the RAM: MacBook Pro: How to remove or install memory - Apple Support https://support.apple.com/en-us/HT201165

 you are testing for both bad RAM or bad bank—

one stick at a time in each bank, If the RAM sticks prove to work individual—and banks work individually.

 Other known issues are:

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