MacBook Pro won't start and beep three times sometimes

Question

MacBook Pro 15" Unibody Mid 2010

Released April 2010 / 2.4, 2.53 GHz Core i5 or 2.66 GHz Core i7 Processors

591 Soru Tümünü görüntüle

Pascal van Dooren @pascalvandooren

İtibar: 13

2

Gönderildi: 13 Mar 2016

Seçenekler

MacBook Pro won't start and beep three times sometimes

Hi,

I have a MacBook Pro 15" from 2010. It used to work fine, but all of a sudden when I tried turning it on one day it wouldn't start up and give me three beeps. I knew this could be a RAM issue, so I reseated the RAM, after which it booted fine again. A day later however the problem returned. This time reseating the RAM didn't do the job. I assumed it was faulty RAM so I ordered a new stick of RAM. Once I got it, I replaced the old one, but the MacBook would still beep three times. After several attempts I got it to boot with the new RAM.

Up to this day, it will almost always beep three times and not boot, although sometimes it will boot. I am absolutely clueless, because an issue with the RAM modules seems ruled out. Does any of you have any ideas what the problem might be? Thanks.

Yanıtlandı! Cevabı görüntüle Ben de bu sorunu yaşıyorum

Bu iyi bir soru mu?

Evet Hayır

Puan 1

1 Yorum

Lаѕt wееk I hаd a ѕіmіlаr іѕѕuе, еvеrуtіmе I trіеd turning оn my macbook рrо іt wud rеfuѕе tо ѕtаrt аnd bеер 3 times

Finally I mаnаgеd tо rеѕоlvе thе problem. Apple Mac support helped me

Fоllоw thе ѕtерѕ here: http://bit.ly/Mac3Beeps

It ѕhоuld ѕоlvе the issue

Florence tarafından 25 Haz 2018

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Seçilen Çözüm

mayer @mayer

İtibar: 685,2b

MacHale Enterprises

3,4b

1,1b

2,6b

Gönderildi: 13 Mar 2016

Seçenekler

OK the three Beeps are a RAM issue, as you already know. You are correct, and did the right thing.

Now you need to test if a slot has gone bad or partially bad.

Remove the RAM, use canned air and blow the slot out.

Take one stick only, try it in both slots to check out both the RAM and the slot.

Now you have known good or bad sticks or known bad slot.

If the slot, try loosening the screws that hold the slot in place - crazy, I know but it can work.

Test again.

If RAM is bad, trash it.

If slot is bad, use the screw solution or sometimes it will take a lessor stick (if you have one).

If not live with one stick, the highest your machine will take. ( a 4MB)

RAM Type: PC3-8500 DDR3 Min. RAM Speed: 1066 MHz

Standard RAM: 4 GB Maximum RAM: 8 GB

In the past I have found, after many days of trail and error, that the RAM may have had ESD damage and cause erratic behavior. Work one day and not the next. Unless you are a Professional the time spent discovering this is nauseating. To test it you need a program like Atomic by Micromat: http://www.micromat.com/store#atomic

Bu yanıt yardımcı oldu mu?

Evet Hayır

Puan 9

8 Yorum:

Thanks for the reply mayer. I have already tried blowing it out with compressed air and trying each stick of RAM seperately in both slots, but with no avail. None of the possible set-ups are guaranteed to work; sometimes it beeps, sometimes it boots. I'll try the screw trick. Any thoughts on why none of the possible set-ups works??

Pascal van Dooren tarafından 13 Mar 2016

I got it to boot again just now, but now the screen would start to flicker with a bunch of coloured horizontal lines and then it black. What could this be?

Pascal van Dooren tarafından 13 Mar 2016

You were answering while I was still editing. Now you have new symptoms and I question if your identification of your machine is correct because this sounds like an issue I know with another machine. Symptoms change, thus does the diagnosis.

mayer tarafından 13 Mar 2016

How do you mean the identification of my machine is not correct?

Pascal van Dooren tarafından 13 Mar 2016

You started with a RAM problem and now have video issues. Video issues are known to exist on these machines:https://www.apple.com/support/macbookpro...

Please go here and enter your serial number to correctly identify your machine,

http://www.everymac.com/ultimate-mac-loo...

It's way past my bed time so I'm going to have to continue in the morning.

mayer tarafından 13 Mar 2016

3 tane daha yorum göster

Yorum Ekle

Lаѕt wееk I hаd a ѕіmіlаr іѕѕuе, еvеrуtіmе I trіеd turning оn my macbook рrо іt wud rеfuѕе tо ѕtаrt аnd bеер 3 times

Finally I mаnаgеd tо rеѕоlvе thе problem. Apple Mac support helped me

Fоllоw thе ѕtерѕ here: http://bit.ly/Mac3Beeps

It ѕhоuld ѕоlvе the issue — Florence
Thanks for the reply mayer. I have already tried blowing it out with compressed air and trying each stick of RAM seperately in both slots, but with no avail. None of the possible set-ups are guaranteed to work; sometimes it beeps, sometimes it boots. I'll try the screw trick. Any thoughts on why none of the possible set-ups works?? — Pascal van Dooren
I got it to boot again just now, but now the screen would start to flicker with a bunch of coloured horizontal lines and then it black. What could this be? — Pascal van Dooren
You were answering while I was still editing. Now you have new symptoms and I question if your identification of your machine is correct because this sounds like an issue I know with another machine. Symptoms change, thus does the diagnosis. — mayer
How do you mean the identification of my machine is not correct? — Pascal van Dooren
You started with a RAM problem and now have video issues. Video issues are known to exist on these machines:https://www.apple.com/support/macbookpro...

Please go here and enter your serial number to correctly identify your machine,

http://www.everymac.com/ultimate-mac-loo...

It's way past my bed time so I'm going to have to continue in the morning. — mayer