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  1. #16


    Member Since
    Jan 11, 2017
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    Extra added RAM can also be a possible cause for not recognised bootable USB devices. In that case a restart in boot mode with original RAM configuration as supplied with computer will be the solution. Please don't think I'm the expert, I just read this in an other forum while searching for a solution.
    Last edited by PearlyPearl; 01-11-2017 at 06:27 PM. Reason: additions

  2. #17

    Rod Sprague's Avatar
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    MacBook Pro OS 10.11.1, iPhone 5s iOS 9.2, 4th Gen iPod touch iOS 5, Apple TV 2, iPod Classic 80Gb
    If the Macbook can boot into the Recovery partition have you tried booting to that and perform a repair with Disk Utility?
    Because of your model you may not be able to use the Apple hardware Test https://www.lifewire.com/use-apple-h...oblems-2259973 but if possible this is also worth a try.
    I used to be conceited but now I'm perfect.

  3. #18

    pigoo3's Avatar
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    May 20, 2008
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    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Quote Originally Posted by PearlyPearl View Post
    Extra added RAM can also be a possible cause for not recognised bootable USB devices. In that case a restart in boot mode with original RAM configuration as supplied with computer will be the solution. Please don't think I'm the expert, I just read this in an other forum while searching for a solution.
    The 5gig of RAM that I saw listed for this MacBook seemed kind of strange. Usually it's either 2gig, 4gig, or 8gig of RAM.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  4. #19

    Rod Sprague's Avatar
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    Well spotted Nick, I missed that. As you say it really should be an even number.
    I used to be conceited but now I'm perfect.

  5. #20


    Member Since
    Jan 11, 2017
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    Yes, I performed a repair with Disk Utility. Regarding odd number of RAM: As long the 1GB of RAM isn't slower than the 4GB of RAM, the odd number shouldn't be a problem? Why should it really be 2, 4 or 8 GB?

  6. #21

    MacInWin's Avatar
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    Jul 07, 2008
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    2015 rMBP, 2008 iMac, iPhone 7, iPad mini, 13" MBP, AppleTV and two MacMinis
    Normally one installs memory in pairs of modules. So two 1GB modules is 2GB, two 2GB modules is 4gB, etc. We just don't normally see odd numbers because of the pairing. I have heard that mismatches can sometimes affect memory performance, but I have no objective evidence to support that. But 5 is definitely a unique size for memory!

  7. #22


    Member Since
    Jan 11, 2017
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    Probably the former owner had 2x1GB RAM installed. He/she replaced one with 4GB RAM.

  8. #23

    pigoo3's Avatar
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    Specs:
    2011 13" MBP 2.3ghz, 8gig ram, OS 10.8.5
    Yes. The only way to get 5gig is 1gig + 4gig. As MacInWin mentioned...usually RAM is installed in matched pairs. Usually the only combo other than matched pairs is 4gig + 2gig = 6gig.

    4gig + 1gig = 5gig is unusual. This may or may not have lead to any issue's. Just an unusual combo.

    - Nick
    - Too many "beachballs", read this: Beachballs
    - Computer seems slower than it used to? Read this for some slow computer tips: Speedup
    - Almost full hard drive? Some solutions. Out of Space
    - Apple Battery Info. Battery

  9. #24


    Member Since
    Oct 16, 2010
    Location
    Brentwood Bay, BC, Canada
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    Quote Originally Posted by PearlyPearl View Post
    Probably the former owner had 2x1GB RAM installed. He/she replaced one with 4GB RAM.

    That's logical and makes sense:

    "Standard RAM: 2 GB Maximum RAM: 8 GB*
    Details: 2 GB of RAM is installed as two 1 GB modules, no slots free. "
    http://www.everymac.com/systems/appl...009-specs.html

    No problem with not having paired RAM installed with that MB model AFAIK or from what I can find.


    Not much choice when Apple only provides those models with only TWO RAM Slots.






    - Patrick
    ======

  10. #25


    Member Since
    Oct 16, 2010
    Location
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    Because of your model you may not be able to use the Apple hardware Test https://www.lifewire.com/use-apple-h...oblems-2259973 but if possible this is also worth a try.

    Thanks for that info Rod. I wasn't aware that was possible.






    - Patrick
    ==========

  11. #26

    Rod Sprague's Avatar
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    Specs:
    MacBook Pro OS 10.11.1, iPhone 5s iOS 9.2, 4th Gen iPod touch iOS 5, Apple TV 2, iPod Classic 80Gb
    As for my query about RAM (excuse my lack of knowledge) but I was not aware that there was a compatible 1Gb RAM chip for that model but a little research shows that indeed some models came with 2X1Gb RAM chips. This means that someone has replaced one with a 4Gb chip. This is contrary to advice to keep matched pairs but may not be an issue. However it is possible that the 1Gb chip has died and that would be a problem.
    I used to be conceited but now I'm perfect.

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