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Try swapping the memory in the two slots. It sounds like either one of the memory chips is bad or one of the memory slots is bad. If you find that one of the slots is bad, then you might try just putting a 1GB Chip in the slot that works.
visit vaio manual in ftp://ftp.vaio-link.com/pub/Manuals/Notebooks/ You can do this in two ways: opening your
notebook and taking a look on the memory modules already installed (we
will explain more about this later) or running a program like Everest (available on our download section).
We ran Everest (going to Motherboard, Chipset, Memory Slots) on our
notebook and found that it was using two 256 MB DDR-SDRAM PC2700
(“DDR333”) modules, for a total of 512 MB. click to enlarge Figure 1: Checking your current memory configuration with Everest.
If your notebook has an empty memory slot, just go to the computer
store and buy a new SO-DIMM module with the same technology (SDRAM or
DDR-SDRAM) and speed of any capacity you want – of course you need to
know the capacity limit of your notebook. You cannot install a 1 GB
module in a notebook that only accepts modules up to 512 MB, for
example. Our notebook – a Sony Vaio PCG-V505ECP – accepts modules up to
1 GB, for a total of 2 GB RAM, since it has two memory slots.
For example, if your notebook has one 256 MB module and an empty
memory slot, if you buy and install another 256 MB module, it will have
512 MB RAM. If you buy and install a 512 MB module, your notebook will
have 768 MB.
If your notebook already has two memory modules, you will need to
remove one of the installed modules in order to install the new one. If
the two modules have the same capacity, it doesn’t matter which one you
will take away, but if they have different capacities, remove the one
with smaller capacity. The new RAM capacity of your notebook will be of
the capacity of the remaining module plus the capacity of the new
In our case, our notebook has two 256 MB modules. So we will remove
one of these modules and install a new one on its place. We bought a 1
GB-module, so after installing it our notebook will have 1,280 MB RAM
installed (memory math is tricky, since 1 GB equals to 1,024 MB not
1,000; so 1,024 MB + 256 MB = 1,280 MB).
How much memory did it have before you removed the 256Mb RAM?
If it had 756Mb RAM then the memory in the laptop has 512 Mb plus 256 Mb RAM modules, the 256Mb in the slot you can see and possibly 512Mb in a slot under the keyboard or soldered on the motherboard.
Therefore by removing the 256Mb and replacing with 1Gb memory module will give you a total of 1.5Gb
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.
0 MB on-board memory expandable to 512 MB Two SO-DIMM slots SO-DIMM sockets accept 8-, 16-, 32-, 64-, 128-, and 256-MB SDRAM modules in any combination. Use only PC100 memory modules.
so yeah you bought the wrong ram
This is helpful for process on changin ram.CLICK HERE
As far as i can tell your computer will hold up to 1024 megs of ram that is 2 512 sticks. Just pic up the other 512 and call it a day that way you know your maxxed out on ram anyway. Not sure if it will take the different size sticks as I haven't found anything on their site. TRY HERE
There are two slots for memory on that laptop and it will take a maximum of 2GB of RAM. The memory type is
1.8-V SODIMM DDR-2. The cover ont he bottom if the laptop is easy to access and add more memory.
How many RAM slots do you have? Are they coloured differentlly? For example 2 blue, 2 black. If so.. Put one 512 MB DIMM in either a black one or a blue one, and the other DIMM in the other slot of the same colour.
There should be a reset button on bottom of laptop....if not...remove battery, power supply plug and remove the mbottom panels....under one of them is a battery the size of one of two....either 6mm in diametre or one of 22mm in diametre...remove it and leave laptop for about 5 min....remove memory,touch the memory's golden edges briefly with your fingers to discharge charge in memeory.put everything together...should solve your problem.