Memory Problem I have a Toshiba Satellite and I recently bought 1GB of memory, now I have 2 memory slots and one slot has 512MB in it so i went out and bought another 1GB of memory and replaced the 512 but the computer wouldnt boot up. So i took the 1GB out and put the 512 back in and it booted up so what went wrong??

Your Toshiba Satellite has 2 memory slots and will hold a total of 4GB (each slot can hold 2GB). It uses DDR2 PC2-4200 or DDR2 PC2-5300 Memory chips.

Below is a link that gives all the info and prices from 4 All Memory.

http://www.4allmemory.com/memory/toshiba-other-a215-series/

It sounds like a speed issue, in the difference between the 4200 and 5300.

Is memory matched (DDR2 667)

Have you put original mem in slot 2

Download / install CPU-Z with both modules in and run program to see if it shows.

If all above is correct may be damaged mobo.

This is for your laptop from vendors site.

Memory5
• Configured with 512MB DDR2 SDRAM (1 slot occupied and 1 available)
• 512MB(min)/2048MB (max), 2 memory slots using 256MB, 512MB or 1024MB PC4200 DDR2 533MHz SDRAM.

Standard Memory : 512MB or 1GB Maximum Memory : 2GB ( 2 x 1GB) Total Memory Slots : 2 Memory Type : DDR2 533MHz (PC2-4200) 200-PIN SODIMM

There are 2 types of memory, one for laptops and one for pc.

Your additional stick seems to be for pc from what your saying.

Additional thoughts:
I'm sure you can buy sticks for laptops at walmart or whereever you bought ur laptop. Just make sure it is the same speed type. Example: yours is 512mb ddr PC 5200, you will need to find PC5200, the 512mb and up you shouldnt have to worry about. So do your research before you upgrade or you will burn your laptop.

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

• your Toshiba Satellite M35X-S311 has the following memory configuration
  
• Configured with 512MB
  
• The maximum memory you can have is 2048MB (Max),
  
• 2 memory slots using 1024MB PC2700 DDR333 SDRAM 2.5V SODIMM Memory modules (Both slots may be occupied). Go to a store and request for this memory specification and you will have 2GB of memory for all the programs you have listed here. Good Luck!
  

The right memory for your laptop is

256MB Memory (PC2-4200) KTT533D2/256, PA3389U-2M25 KTOS534

512MB Memory (PC2-4200) KTT533D2/512, PA3412U-1M51, PA3412U-2M51 KTOS535

1GB Memory (PC2-4200) KTT533D2/1G, PA3411U-2M1G KTOS536

Using the wrong memory can caused motherboard failure.

Try reinserting the old one memory module.
Be sure that the memory is placed in the right way

Hi,

Take out all the memory cards and wipe the gold part of the memory modules.

Then insert the two 512 modules & check the memory.

If it shows the correct readings, then the two modules are detected.

Then insert the 1 gb & other one 512 module.

If it shows the correct readings, then the two modules are detected.

Then use the other one gb with the same 512 & check if it shows the correct readings.

Then the two 2 gb modules are fine.

Now insert the two 1 gb modules & check now.

There are ECC type & non-ECC type memory modules are available, chck which one your computer supports & which type you have.

If it shows the correct readings, then the two modules are detected and fine.

Then you can also swap the slot and check if any memory module is not detectd correctly.

Some have four slots & i dont know how many slots your laptop have.

Good Luck.

Live, Love, Laugh. 

i dont know as much about laptops but you should be able to get the 512MB. to replace it look on the bottom on the laptop there should be somewhere down there that you can open up the to put it in.