1 GB to 4 GB Macbook Upgrade Issues

Discussion in 'MacBook' started by letawookiewin, Nov 26, 2011.

  1. macrumors newbie

    Sep 27, 2010
    Hey guys,

    I recently sought to upgrade my late 2008 2.1 GHz Intel Core Duo Macbook from 1 GB of memory to 4 GB. I'm using 2 new 2GB RAM chips from Best Buy (PNY DDR2). Installed them...Macbook wont boot up (light turns on, black screen, sound doesn't occur/nothing happens). However, keeping one of the old 512 MB ram chips in and one of the new 2 GB ram chips in will work fine with total memory equalling 2.5 GB and the computer is quite faster...just having the two new ones in wont work. But, I know this Macbook is capable of 4GB total.

    I did a little research and found other people having similar problems with this issue, but really didn't find any definitive answer. Should I return the RAM and try a different brand? Any solutions?

    Also, for the time being, if I keep one of the new 2 GB PNY ram chips in along with one of the old 512 MB chips, should this cause my macbook any problems with things like crashes, updates, firmware, etc? (mismatched ram chips).

  2. macrumors 604

    Cave Man

    Your new chips have improper timings for your MacBook. When you have the old chip in it likely causes the new chip to decrease its speed to match the old chip's timing, thus allowing the computer to function. Macs tend to be picky about such things, so you need to be sure to buy RAM sticks that are certified for your Mac.

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