Go Back   MacRumors Forums > Apple Hardware > Notebooks > MacBook Pro

Reply
 
Thread Tools Search this Thread Display Modes
Old Apr 18, 2012, 07:01 PM   #1
xRaRFx
macrumors newbie
 
Join Date: Dec 2010
Location: Veracruz, Mexico
Send a message via Skype™ to xRaRFx
Disappearing Ram and Sleep Issues Macbook pro Lion sometimes recognize 4Gb not 8Gb

Hello,
I have been having an issue with the RAM on my macbook pro unibody, mid 2009 (model 5,5), since i upgraded from the original 2x1GB to 2x4GB acquired on the internet, from a certified supplier (OWC): Sometimes, the computer does not recognize one of the chips, showing only 4 Gb mounted, other times it shows both chips, thus 8 GB… but it seems to do so randomly. The ram disappears especially after a permission repair and a reboot, or a hard reboot.

This issue occurred one week after I received the Ram, and I have checked by switching the chips with the original ones, and it occurs with the latter too, so I have excluded the possibility of defective ram. I have tested the banks, and the one in which the ram is not detected is always the lower one, never the top one (Bank 1, never bank 0).

Since the occurring of this issue, I have also had issues with the Sleep mode: sometimes, when I send my mac to sleep by shutting the lid, it will go to sleep, only to never wake up when I open the lid, forcing me to hard reset it. the status led, when I send it to sleep, starts pulsing normally, but when I open the lid it turns off, but the display doesn't turn on, and if I close the lid the status led stays on, and after some while the fans start running (occasionally).
this happens often, but sometimes it doesn't. here too, it seems to be on a random basis.

If I, however, send the mac to sleep through the apple menu and then close the lid and wake it with the power button, no issue occurs.

I have tried resetting SMC, PRAM, cleaning caches, Advanced Hardware Test from the DVD, but nothing.

for what concerns the RAM, I have tried with both the original and the compatible ram by inserting either only in slot 0 (the uppermost slot), in which case it always is detected, and only in slot 1 (the lowermost), in which case it is never detected and the computer emits the system beep (but I believe this could be normal - I am no technician).

Then, last week, the computer booted up showing 7.75 GB total ram, but only in one slot, and the strange thing was that it didn't recognize 8 Gb or 4, but 7.75.
this got me worrying, a bit.

Has anyone had the same issues? or, better, resolved the matter?

By the way, I am running OS 10.7.3
xRaRFx is offline   1 Reply With Quote
Old Apr 19, 2012, 03:46 AM   #2
xRaRFx
Thread Starter
macrumors newbie
 
Join Date: Dec 2010
Location: Veracruz, Mexico
Send a message via Skype™ to xRaRFx
I don't know if this has any relation nor if it could help, but I have found that whenever I remove the RAM physically and put it back again the computer always finds the 8Gb of RAM, tho I can't keep doing it again everytime I want to edit videos cuz I do it in a regular basis.
xRaRFx is offline   0 Reply With Quote
Old Apr 19, 2012, 04:04 AM   #3
paul117
macrumors regular
 
Join Date: Feb 2012
Quote:
Originally Posted by xRaRFx View Post
Hello,
I have been having an issue with the RAM on my macbook pro unibody, mid 2009 (model 5,5), since i upgraded from the original 2x1GB to 2x4GB acquired on the internet, from a certified supplier (OWC): Sometimes, the computer does not recognize one of the chips, showing only 4 Gb mounted, other times it shows both chips, thus 8 GB… but it seems to do so randomly. The ram disappears especially after a permission repair and a reboot, or a hard reboot.

This issue occurred one week after I received the Ram, and I have checked by switching the chips with the original ones, and it occurs with the latter too, so I have excluded the possibility of defective ram. I have tested the banks, and the one in which the ram is not detected is always the lower one, never the top one (Bank 1, never bank 0).

Since the occurring of this issue, I have also had issues with the Sleep mode: sometimes, when I send my mac to sleep by shutting the lid, it will go to sleep, only to never wake up when I open the lid, forcing me to hard reset it. the status led, when I send it to sleep, starts pulsing normally, but when I open the lid it turns off, but the display doesn't turn on, and if I close the lid the status led stays on, and after some while the fans start running (occasionally).
this happens often, but sometimes it doesn't. here too, it seems to be on a random basis.

If I, however, send the mac to sleep through the apple menu and then close the lid and wake it with the power button, no issue occurs.

I have tried resetting SMC, PRAM, cleaning caches, Advanced Hardware Test from the DVD, but nothing.

for what concerns the RAM, I have tried with both the original and the compatible ram by inserting either only in slot 0 (the uppermost slot), in which case it always is detected, and only in slot 1 (the lowermost), in which case it is never detected and the computer emits the system beep (but I believe this could be normal - I am no technician).

Then, last week, the computer booted up showing 7.75 GB total ram, but only in one slot, and the strange thing was that it didn't recognize 8 Gb or 4, but 7.75.
this got me worrying, a bit.

Has anyone had the same issues? or, better, resolved the matter?

By the way, I am running OS 10.7.3
might i sugest trying the orignal ram if possable?
paul117 is offline   0 Reply With Quote
Old Apr 19, 2012, 12:58 PM   #4
Interstella5555
macrumors 603
 
Interstella5555's Avatar
 
Join Date: Jun 2008
Sounds like faulty RAM.
Interstella5555 is offline   1 Reply With Quote
Old Apr 19, 2012, 01:05 PM   #5
heisenberg123
macrumors 603
 
heisenberg123's Avatar
 
Join Date: Oct 2010
Location: Hamilton, Ontario
Quote:
Originally Posted by Interstella5555 View Post
Sounds like faulty RAM.
agreed

run this to test

MemTest
__________________
15" i7 Quad Core MBP (Early 2011) 2.0GHz, 16GB RAM, 1TB HD, AMD Radeon HD 6490M(Intel HD Graphics 3000) OSX 10.9
16GB Samsung Galaxy SIII with 32GB microSD
heisenberg123 is online now   0 Reply With Quote
Old Apr 19, 2012, 05:51 PM   #6
xRaRFx
Thread Starter
macrumors newbie
 
Join Date: Dec 2010
Location: Veracruz, Mexico
Send a message via Skype™ to xRaRFx
I will run some tests

I dubt that it's a RAM issue because I have changed the position of the RAM repeatedly and the slot that sometimes disappears is always the Bank 1 (it doest matter which RAM piece is in it), but I'll test the original Apple RAM to see if it shows something.
Thanks for the reply
xRaRFx is offline   0 Reply With Quote
Old Apr 19, 2012, 07:29 PM   #7
jaqueh
macrumors member
 
Join Date: Apr 2012
Quote:
Originally Posted by xRaRFx View Post
I dubt that it's a RAM issue because I have changed the position of the RAM repeatedly and the slot that sometimes disappears is always the Bank 1 (it doest matter which RAM piece is in it), but I'll test the original Apple RAM to see if it shows something.
Thanks for the reply
dude same thing happens to me, OWC is sending me new ram sticks
jaqueh is offline   2 Reply With Quote
Old Apr 19, 2012, 09:33 PM   #8
xRaRFx
Thread Starter
macrumors newbie
 
Join Date: Dec 2010
Location: Veracruz, Mexico
Send a message via Skype™ to xRaRFx
Thanks

Quote:
Originally Posted by jaqueh View Post
dude same thing happens to me, OWC is sending me new ram sticks
okay, I'll will call them to see what happens =)
xRaRFx is offline   0 Reply With Quote
Old Apr 20, 2012, 07:01 AM   #9
heisenberg123
macrumors 603
 
heisenberg123's Avatar
 
Join Date: Oct 2010
Location: Hamilton, Ontario
Quote:
Originally Posted by xRaRFx View Post
okay, I'll will call them to see what happens =)
did you run MemTest?
__________________
15" i7 Quad Core MBP (Early 2011) 2.0GHz, 16GB RAM, 1TB HD, AMD Radeon HD 6490M(Intel HD Graphics 3000) OSX 10.9
16GB Samsung Galaxy SIII with 32GB microSD
heisenberg123 is online now   0 Reply With Quote
Old Jul 16, 2012, 11:11 AM   #10
magicq99
macrumors newbie
 
Join Date: Jul 2012
Hello, I seem to experience the same issues. My Mac is a Mid 2009 17-inch MacBook Pro (running the current version of Lion).

I upgraded the standard 2x2GB RAM with 2x4GB RAM purchased from crucial.com about 2 years ago. Everything was running fine.

The system run perfectly well until about 2 months ago. Then I experienced the same issues as described by the user "xRaRFx".

The system won't wake from sleep. A hard reset brings the system back up, but the system profiler reports only half of the memory.

Shutting the computer down again and rebooting sometimes fixes the problem, but not always immediately. So far it seems to fix itself after a while by another reboot.

When it happened again, I tried to swap the RAM slots. It was running fine again after that, but after about two weeks the problem returned again.

A few weeks ago, when the problem reappeared, I inserted the original RAM by Apple. The system was running fine after that, so I assumed there was some sort of fault with the third-party RAM.

However, yesterday the problem reappeared again, this time with the original RAM! So I'm inclined to rule out the memory itself.

Removing and reinserting the RAM did not resolve the problem yesterday. An additional reboot did not solve it either.

However, when booting the system today it's running again with the full 4GB of the Original RAM! Apparently, letting it rest for some hours while shut down fixed it again.

Somehow the issue seems to fix itself by rebooting and/or letting the system rest for some time.

Running the memtest program mentioned above results in "All tests passed!"

I would also like to mention that I do NOT experience any issues while the system is running. Defective RAM or a defective slot should manifest itself in some weird crashes or system lockups, shouldn't it? But there is nothing, the systems runs perfectly well all day.

So far the RAM slot does not "disappear" during normal operation. It only happens sometimes after waking from sleep.

Has anyone figured out how to fix this? I have warranty on my system until December, so if the issue reappears I will contact Apple Care. However, I fear they won't be able to replicate the issue, since it only seems to happen randomly every few weeks and magically fix itself after some reboots.

But it always starts with the system not waking from sleep. (To be exact, parts of it seem to wake from sleep, the fans are starting, but nothing else. just a black screen. only a hard reset has any effect) But again, after the issues "fixes itself", the system will run fine for several days or weeks without any issue until it suddenly reappears.

Last edited by magicq99; Jul 16, 2012 at 11:25 AM.
magicq99 is offline   0 Reply With Quote
Old Sep 2, 2012, 03:37 PM   #11
acarr468
macrumors newbie
 
Join Date: Sep 2012
I keep having the same issue, my Mac will randomly refuse to wake from sleep and will often drop one of my 2 4Gb sticks on reboot. The Apple genius couldn't really figure it out, she recommended replacing the logic board ($310) which isn't really an option. If anyone has any other ideas what the problem might be, I would be very appreciative.

Thanks,
Adam
acarr468 is offline   0 Reply With Quote
Old Jan 13, 2013, 11:12 AM   #12
Kogenesis
macrumors newbie
 
Join Date: Jan 2013
Also having this issue

I've got a 13-inch Mid 2009 2.26 Ghz Core 2 Duo Macbook Pro with 2x4Gb of 3rd party ram that I threw in when I first bought the computer in 2009. The waking issues began for me in December 2012 and are exactly as the other people have described. I don't know what else to do to try and solve the problem. Any suggestions?
Kogenesis is offline   0 Reply With Quote
Old Jan 13, 2013, 01:23 PM   #13
acarr468
macrumors newbie
 
Join Date: Sep 2012
I ended up "solving" the problem by removing a stick of RAM from the problem RAM slot. It appears that one of my RAM slots failed, so if you pull out the stick that is in the failed slot you will be fine. To see which stick is bad, go to System Information -> Memory and see which stick isn't recognized. If both are recognized, keep checking every time you wake the computer from sleep until that slot fails to load. You shouldn't have any crashing if nothing is plugged into that slot.

The problem could be ultimately fixed with a $300 logic board replacement, but I'd rather not spend that on a 3.5 year old laptop...

Hope this helps,
Adam
acarr468 is offline   0 Reply With Quote
Old Feb 5, 2013, 03:12 AM   #14
quadturbo
macrumors newbie
 
Join Date: May 2010
Location: US
After trying every possible solution to this disappearing ram issue, including doing a low level format and reinstalling everything (did not work), the only thing that worked was COOLING the macbook down. In summary, I have a stock 8 gb macbook pro 2010 model with 512 ssd. I have recently noticed that I would have 4 gb of ram. THE ONLY way to get 8 gb back was to turn off the laptop for a while OR put it in the freezer for 10 minutes (yes it works consistently). After "freezing" i get all 8 gb backs.
quadturbo is offline   0 Reply With Quote
Old Feb 15, 2013, 12:44 AM   #15
robguthrie
macrumors newbie
 
Join Date: Feb 2013
I am getting the same problem

Hi,
I am having the same problems.

Macbook Pro 13inch 2010 (7,1) model

I have two sets of ram sticks, (2x2GB and 2x4GB) and the computer will not wake from sleep and occasionally reports only half the memory is present.

Otherwise the machine is fine. Never crashes while running. I've not run memtest but I will shortly. (However I don't believe we are all just members of the "2 sets of faulty ram causing our computers to all fail the same way" club)

I assume that the motherboard contains a fault, but, I've only been having these problems since I upgraded to 10.8 - however I'm willing to believe that that correlation is just coincidental.

Anyone else had any luck resolving this?
robguthrie is offline   0 Reply With Quote
Old Feb 28, 2013, 12:57 PM   #16
quadturbo
macrumors newbie
 
Join Date: May 2010
Location: US
I believe I have found a DEFINITIVE solution to an identifiable problem. I have a Macbook Pro 13" 2010, with 8 gb ram. In the last 6 months, I have had Bank 1 (4 gb) disappearing on me intermittently. In the last two months, I had consistent loss of 4 gb of ram, especially after restart. When I start cold (after 24 hours), it recognizes 8 gb, but if I restart, it recognizes only 4 gb. I would stick the macbook in the freezer for 10 min. Of course, I get 8 gb.

So what the ****?

I have gone through every thread google has to offer. No solution, except that the best explanation was that circuit board was getting old. It explains why Apple created new vents for the new Macbooks. I also believe they soldered in the ram for this exact reason.

So I got sick of it and opened up the macbook, unscrewed, removed, cleaned out the fan, unscrewed the circuit board removed the Ram. I even unscrewed the 4 screws around the plastic RAM holder. I cleaned everything out with 91% isopropyl alcohol and everything inside the RAM holder and the ram itself.

I tested each RAM in each slot alone and carefully turned the computer on. 4 gb as expected. Both banks worked. Both RAM functioned fine alone in each of the banks.

So what the ****?

I popped both back in.....8 gb. Restarted it. 8 gb. I did this 10 x. Every time 8gb.

So I thought it was because I did a great "cleaning" job. I screwed everything back in, circuit board, RAM "holder", etc. Restarted....7.75 gb. !?

Restarted again.... 4gb?! DId this 10x, 4 gb.

What the ****?

I opened everything and LOOSENED the four screws around the Ram HOLDER.....

8 gb ever since!

I believe with time, the awesome heat from the macbook pro eventually warps the circuit board. My macbook was just under 3 years old and started to have this problem. The four screws holding the ram holder in start to tighten up with heat and somehow it does not recognize one bank. That's why when I freeze the macbook, it gets the other bank back. By loosening the screws, it allows the circuitboard expansion with heat.

Anyways, I hope that helps.
quadturbo is offline   7 Reply With Quote
Old Apr 3, 2013, 04:47 PM   #17
PrimoSlate
macrumors newbie
 
Join Date: Apr 2013
Thumbs up

Quote:
Originally Posted by quadturbo View Post
I opened everything and LOOSENED the four screws around the Ram HOLDER.....

8 gb ever since!

I believe with time, the awesome heat from the macbook pro eventually warps the circuit board. My macbook was just under 3 years old and started to have this problem. The four screws holding the ram holder in start to tighten up with heat and somehow it does not recognize one bank. That's why when I freeze the macbook, it gets the other bank back. By loosening the screws, it allows the circuitboard expansion with heat.
You sir, are a genius.

I've been fighting with this issue for months. I even had apple replace my logic board, as per their recommendation for a mere $300.00 -- I was just about to take it back to apple when I came across your reply, quadturbo.

I can attest to this being a solid solid solution for the described issues. (1. Unavailable RAM, usually half and 2. not waking after opening lid, having to force reboot.)

Thanks again for sharing, mate.
PrimoSlate is offline   0 Reply With Quote
Old Apr 7, 2013, 07:04 AM   #18
imyselfandi
macrumors newbie
 
Join Date: Feb 2012
Quote:
Originally Posted by quadturbo View Post
I believe I have found a DEFINITIVE solution to an identifiable problem.

I opened everything and LOOSENED the four screws around the Ram HOLDER.....

I believe with time, the awesome heat from the macbook pro eventually warps the circuit board. My macbook was just under 3 years old and started to have this problem. The four screws holding the ram holder in start to tighten up with heat and somehow it does not recognize one bank. That's why when I freeze the macbook, it gets the other bank back. By loosening the screws, it allows the circuitboard expansion with heat.

Anyways, I hope that helps.
As the other post said, you are a genius. I would never have thought of this. I opened up my Mac, removed the logicboard, cleaned everything, replaced the heat sink paste, reinstalled the operating system... you name it. Nothing worked. I thought it might be my optibay or SSD drive. Then I loosened the screws as described. It now wakes from sleep normally. What a relief - I can't thank you enough!
imyselfandi is offline   1 Reply With Quote
Old Apr 16, 2013, 12:54 PM   #19
ironflippy
macrumors newbie
 
Join Date: Jun 2009
I've been having the same problem for the past year or so. Just loosened the screws. If this works, then I owe you a hundred beers, this has been such a headache.
ironflippy is offline   1 Reply With Quote
Old May 23, 2013, 11:34 AM   #20
jesse12345
macrumors newbie
 
Join Date: May 2013
Created an account to come here and say that loosening the screws worked for me. I can't thank you enough quadturbo. This has been the biggest headaches for over a year now, and I can't believe it's finally fixed.
jesse12345 is offline   0 Reply With Quote
Old May 31, 2013, 08:06 AM   #21
Spikeefix
macrumors newbie
 
Join Date: Nov 2010
Wow, thanks for the geniuses here! I have had this exact problem, and I look forward to getting it fixed when I get home. Do Apple Geniuses know about this, because I just took it in to the store and it's continued having problems since then.

Spikeefix is offline   0 Reply With Quote
Old Jun 6, 2013, 02:36 PM   #22
Spikeefix
macrumors newbie
 
Join Date: Nov 2010
Thanks. This worked. Two Geniuses at Apple couldn't figure it out, but this worked like a dream. Good Grief, Apple, come on!

Thanks again, quadturbo!
Spikeefix is offline   0 Reply With Quote
Old Jun 8, 2013, 08:40 PM   #23
shervie
macrumors newbie
 
Join Date: Jun 2013
Talking

Quote:
Originally Posted by quadturbo View Post
I opened everything and LOOSENED the four screws around the Ram HOLDER.....

8 gb ever since!
I literally made an account just to thank you! THANK YOU!
I've had this problem for over 2 years now on and off. I had lost hope. I'm not even sure why I even bothered looking again but I'm glad I came across your post quadturbo. Really Appreciate it.
shervie is offline   0 Reply With Quote
Old Jun 9, 2013, 03:25 AM   #24
KUguardgrl13
macrumors 68000
 
Join Date: May 2013
Location: Kansas, USA
Quote:
Originally Posted by quadturbo View Post
I believe I have found a DEFINITIVE solution to an identifiable problem. I have a Macbook Pro 13" 2010, with 8 gb ram. In the last 6 months, I have had Bank 1 (4 gb) disappearing on me intermittently. In the last two months, I had consistent loss of 4 gb of ram, especially after restart. When I start cold (after 24 hours), it recognizes 8 gb, but if I restart, it recognizes only 4 gb. I would stick the macbook in the freezer for 10 min. Of course, I get 8 gb.

So what the ****?

I have gone through every thread google has to offer. No solution, except that the best explanation was that circuit board was getting old. It explains why Apple created new vents for the new Macbooks. I also believe they soldered in the ram for this exact reason.

So I got sick of it and opened up the macbook, unscrewed, removed, cleaned out the fan, unscrewed the circuit board removed the Ram. I even unscrewed the 4 screws around the plastic RAM holder. I cleaned everything out with 91% isopropyl alcohol and everything inside the RAM holder and the ram itself.

I tested each RAM in each slot alone and carefully turned the computer on. 4 gb as expected. Both banks worked. Both RAM functioned fine alone in each of the banks.

So what the ****?

I popped both back in.....8 gb. Restarted it. 8 gb. I did this 10 x. Every time 8gb.

So I thought it was because I did a great "cleaning" job. I screwed everything back in, circuit board, RAM "holder", etc. Restarted....7.75 gb. !?

Restarted again.... 4gb?! DId this 10x, 4 gb.

What the ****?

I opened everything and LOOSENED the four screws around the Ram HOLDER.....

8 gb ever since!

I believe with time, the awesome heat from the macbook pro eventually warps the circuit board. My macbook was just under 3 years old and started to have this problem. The four screws holding the ram holder in start to tighten up with heat and somehow it does not recognize one bank. That's why when I freeze the macbook, it gets the other bank back. By loosening the screws, it allows the circuitboard expansion with heat.

Anyways, I hope that helps.
I have to wonder if this will fix my issue as well. I have a mid-2009 13" MBP that still has the original RAM. I've never upgraded or changed the RAM, but I have had the sleep issue as described above. I haven't seen any issues with disappearing RAM yet. Nearly every time I've taken my machine in, they've replaced the hard drive cable (often the hard restarts from the sleep issue led to the question mark folder or the planet on startup). So I guess I should give this a shot and see if it works! I've been thinking about upgrading the RAM and certainly want it to work!
KUguardgrl13 is offline   0 Reply With Quote
Old Jun 14, 2013, 08:54 AM   #25
polymersayb
macrumors regular
 
Join Date: Dec 2012
The screw-loosening didn't work for me unfortunately. In case it doesn't solve it for anyone else, the thing I've had the most luck with is simply to be extra gentle with the laptop. I've noticed I have a tendency to slide my laptop into my bag, and it hits with a little bit of a thud—I think that might be enough to loosen the RAM from the slot and cause all the symptoms above. I've been able to get a week of uptime, and up to 13 days, using that method, and loosening the screws didn't improve on that.

Hopefully this helps someone out. Lucky for me, I need to upgrade anyway because my computing needs have increased drastically lately (which makes a logic board replacement even less worth it) but I know not everyone has that option.
polymersayb is offline   0 Reply With Quote

Reply
MacRumors Forums > Apple Hardware > Notebooks > MacBook Pro

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Similar Threads
thread Thread Starter Forum Replies Last Post
Macbook Pro Retina issues resolved? 13" 8GB ram 256 SSD mickey-gem MacBook Pro 4 Feb 9, 2014 09:31 AM
MacBook Pro 4gb v 8gb Ram paulie6978 MacBook Pro 14 Aug 4, 2012 09:05 PM
New macbook air 4gb ram vs 8gb ram shamsmu MacBook Air 3 Jun 13, 2012 12:56 PM

Forum Jump

All times are GMT -5. The time now is 08:51 AM.

Mac Rumors | Mac | iPhone | iPhone Game Reviews | iPhone Apps

Mobile Version | Fixed | Fluid | Fluid HD
Copyright 2002-2013, MacRumors.com, LLC