My laptop recognize or reject this module.

What operating system?

Toshiba Satellite How to remove keyboard and upgrade memory modules. This post was written by cj2600 on April 28, 2006
Posted Under: Toshiba Satellite A20/A25 --> Removing and replacing memory on a Toshiba Satellite A20 or A25 notebook is not as easy ad it should be. Both memory modules are located under the keyboard. A laptop keyboard has to be replaced in order to get access to the memory modules. Before you remove the keyboard do not forget to remove the laptop battery or you can damage the laptop. Be careful when you remove the keyboard securing strip; do not bend it too much. To remove the memory module from the slot on the system board, release the latches on both sides and the memory module will pop up. It will stay at a 30 degree angle to the system board. Firmly grasp the memory module and remove it from the slot.


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How much of the memory is not being recognized out of the total RAM?
Most laptop video cards do not have built-in RAM and part of the main memory is used for video RAM. Depending upon the video chip, it could grab 256Mb or more RAM for video.
If the RAM is equal to the extra RAM module being installed, then the problem could be incompatible RAM module or a faulty memory expansion slot.
Try and use RAM with the same speed and from the same manufacturer.

Try remove the hard drive, if you can enter the BIOS mode, adjust the setting for hibernate( off recommended ).
If the problem still persist, try remove/ clear the CMOS battery inside the main board.You need to open all the case to do it!!

Hope it's work!!!!

Once you change the ram, you have to boot to the system setup so that the BIOS can recognize the new module.
When inserting the ram module in the slot, it should be at a 30 degree angle to the system and inserted till the golden contacts can not be seen looking straight down at the slot. Then press the module down until the retention clips click. The top edge of the contacts should then be barely visible.
Once the RAM has been properly inserted, then boot to the system setup, exit then boot to windows

Hi,
The reason that XP is only recognizing 3GB of memory is because the operating system is 32bit (X86), what you need for the OS to recognize 4GB is a 64bit (X64) system, does your laptop support 64bit? if it does then get a 64bit install disk, install that and your system will be able to use the full capacity of the 4GB memory installed.



Regards

Are you sure its the correct speed/type of RAM? According to Google your laptop takes PC2700 DDR RAM, ensure you are using this in both slots to avoid problems. If you have it fully inserted into the slot and nothing happens when you swtich it on then the laptop doesnt like that type of RAM and you'll need to change it.

Two ways to approach this.

1. try 1 stick at a time and see if you can boot and the system is working,
2. Download and run memtest to see if you got bad memory.

The motherboard will only recognize 256 module. If you go to crucial.com and run the memory test, it will tell you the maximum memory the motherboard will support. So buyin a higher memory stick is wasting your money since it will not support it.

watis the operating system ur using???????its better to use vista rather than xp on satellite........when did u buy that laptop..


if u use vista drivers vll b detected xp cannnot detect...this is the main  problem