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3 beeps on start up

I'm getting 3 beeps on start up. I have replaced the RAM with RAM I know is good and it still beeps 3 times and doesn't boot. The laptop is less than a year old. It is a Macbook Pro 13". Please help!

Macbook Pro, Mac OS X (10.6.7), We also support apple xserves.

Posted on Mar 22, 2012 7:34 AM

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Mar 22, 2012 7:54 AM in response to Shane Carter

Shane --


Perhaps the RAM sticks are not pushed in hard enough or seated incorrectly.


Or that RAM is the wrong kind.


Your Mac is very positive about it.

Look on About This Mac > More Info > System Report > Memory.

See what type is there, i.e., DDR3.

Is yours that type?

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Jul 14, 2012 11:13 AM in response to Shane Carter

Hi I am also currently having the same problem 3 beeps on start up. I have read articles from this site about the cause of the problem and most answers are pointing to ram failure or something, but in fact i dont think my imac doesnt have a busted ram. It all started when i'm trying to downgrade from lion to snow leopard, I cleaned up my HD from disk utilities and it was a success after that i inserted an OS X snow leopard installation disk then when i rebooted my iMac it just shows grey screen then started to beep.


HELP! Please

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Jul 14, 2012 12:00 PM in response to boggslabayen

Hi boggslabayen,


That reply was for the original creator, but for you it might help if you reseat it, sometimes that's the only issue.

You can type in your serial number into this website or just find your model to find out how to reseat the RAM in these manuals http://support.apple.com/manuals/

Once you've done that, try doing a PRAM/NVRAM reset on your computer http://support.apple.com/kb/HT1379

Tell me if that works 🙂

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Jul 15, 2012 7:05 AM in response to boggslabayen

That's what I was afraid of . . . You've put your Mac at pre-manufacturing OS status. That's why it's not working,not to mention it's for a different machine. There's no way that's going to work, boggs. If you did a complete 00000 erase, and put back the OS yur machine was built for, it MAY work, but you might have pushed it over the ledge.

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Jul 15, 2012 7:33 AM in response to boggslabayen

boggslabayen wrote:


@ ~Bee comes with lion OS but I have an OS X Snow leopard from my sister's iMac


You do realise that even if it had worked to install, you wouldn't be able to charge or run from the battery?

iMacs don't need battery management software and it isn't included on the grey disc.

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3 beeps on start up

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