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New memory not recognised when installed into spare slot

Got new memory card equivelant to memory installed, when fitted nothing happens then get message memory not recognised,
new memory:128mb SODIMM 144pin PC100
CSO8889
do i just fit it in and reboot or do i need to do anything else??
memory is standard at 128mb and is very slow
running windows millenium

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"Put it in and reboot"... be sure the aptop is OFF when you add memory! Otherwise, you can damage BOTH memory and laptop! Once memory is installed there is no "trick" to get it recognized. If it is good and meets the BIOS specs, it will be recognized and registered after a cold boot.

1. Be sure the memory is inserted properly (both clips on the sides are flush with the half-moon tabs between memory and metal clips).

2. Sometimes on a memory slot that has been empty a long time (and gets a bit corroded) it is a good idea to insert the memory, remove it again and reinsert 5 or 6 times (only) to clean the contacts.

3. If number 1 and 2 have been done, and you still have this error, then there is a problem with the memory:

It may be the wrong speed (PC100 instead of PC133, etc)

It may be too LARGE for the BIOS to use (all laptops have maximum memory per slot specs that must be observed, because the laptop cannot see memory that is greater than its specified capacity.

In any case, check the manual or the website for your laptop, to get the specifications for memory type AND capacity per slot, and TOTAL memory if you have two slots -or memory soldered on board).

Posted on Feb 10, 2008

  • celso337 May 25, 2011

    Hola, la capacidad total de este modelo M2352 de eMachines y similares es de 1024Mb, NO de 1280Mb, esto es, tiene dos placas de 256Mb originalmente, una interna y una externa, juntas suman 512Mb, eMachines dice que acepta 1GB y en la web dicen que acepta 1GB, nadie define la capacidad completa, todos venden RAM de 512 y de 1GB, solo cambiando la RAM externa, si se cambia la externa por una de 512Mb mas la interna serán 768Mb totales sin problemas de reconocimiento, se puede cambiar la interna y la externa por un par de RAM de 512Mb sumando 1024Mb o 1GB como dicen sin problemas de reconocimiento, es la mejor alternativa que he deducido, por la falta de información y confusión que genera esa misma informacion.si te pasas de 1024Mb totales, siempre va haber problemas de reconocimiento sin importar la marca o capacidad de la RAM a instalar.

  • Dana Stienheimer
    Dana Stienheimer May 26, 2011

    Sorry,my espanol is insufficient. But my Latin makes me think I understand, so I'll try:

    Some older BIOS 2-slot .laptops/desktops have quirky restrictions on mixing RAM sizes in the two slots. For example, when adding a 1024 and a 256 together, the smaller one may need to be in slot 2 (or "bank 2" as it is sometimes labeled) or vice-versa. Other BIOS may see the first bank (if it was 256) and only address RAM of 256mb after that, 12mb, meaning it would only recognize 512mb, not 1280. So beside cleaning the contacts on the RAM, you should try rearranging the order, IOW, which RAM is in the first slot, which is in the second. Of course, you must check your manual to see if it lists total/maximum RAM capacity, as you may be trying to exceed that restriction. Last, just because two different RAM chips work OK by themselves, does not necessarily mean they can work "together". If they are different speeds, many older BIOS machines will not recognize the second RAM chip..

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