HT202768: About Mac computer startup tones
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Q: What does it mean when my MacBook Pro has 3 successive tones, a 5 second pause (repeating) indicates RAM does not pass a data inte ... What does it mean when my MacBook Pro has 3 successive tones, a 5 second pause (repeating) indicates RAM does not pass a data integrity check? more
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Jun 19, 2015 7:53 AM in response to Aselly24by OGELTHORPE,The three tone sound is indicative of a RAM problem. It will have no affect on the integrity of the data on your HDD.
Pleas advise the EXACT model/year MBP that you have.
Ciao.