Memory upgrade on Satellite A300D-15B

Hi all,
I am having upgrading the ram on my laptop from 4gb to 8gb. First I will post the full details of my laptop then explain the problem.
(Original Configuration)
Satellite A300D-15B
Model : PSAKCE
Bios Ver: 3.30
AMD Turion X2 Ultra Dual-Core Mobile Processor ZM-86 (Upgraded from ZM-80)
Genuine Windows Vista Home Premium 32bit
4096 MB (2048 +2048) PC2-6400 DDR RAM (800MHZ)
Right then, I installed Windows 7 32bit on it ages ago and upgraded the CPU and have never had any issues as i work with computers.
I did some checking and found out my Motherboard supports uo to 8gb of ram and decided to buy two 4gb ram modules. I made sure I got the correct ram for my laptop.
I upgraded the ram and it recognised it without any issue and even stated that 8gb of ram was installed under 'System'in contol panel and in the bios. As it was a 32bit OS it only utilised 3gb of the ram. I then decided to upgrade my OS to Windows 7 Ultimate 64bit and thats when the fun began.
Basically my laptop will not boot if I have more than 4gb of ram installed (In any configuration) and get a BSOD. I have had a few different Stop Error codes but I cant seem to find a solution. Also there arent any/many options to change in the bios so Im stumped.
I have tested the ram modules with Memtest several times without error and have also tried them in different laptops without issue. I know my laptop suppors the 8gb as I had no issues running the 32bit OS.
All my drivers and other software are to date and work fine and have installed all windows updates to date.
Has anyone else had this issue and is there a patch/fix available?
Any help, ideas or suggestions are welcome and hopefully I can sort this problem out. Many thanks in advance.

Hi there,
The Ram I bought is the correct to the letter and is as follows:
Komputerbay DDR2 PC2-6400 @ 800Mhz - 2 x4gb modules.
It has exactly the same Cas latency and timing settings aswell.
You mentioned that it booted fine in 32bit as it didnt address the full 8gb but now on the 64bit OS I have 1 x 4gb module installed and it is recognised without any issues,.
If the ram wasnt compatible in any way then I should be getting some errors or something to indicate a problem.
It also wouldnt boot/run properly with just 1 of the 4gb modules installed on either 32/64bit OS's, which isnt the case at all. I am certain that the ram itself isnt the issue.
I also tried installing 1 x 2gb and 1 x 4gb module for a total of 6gb and I managed to get windows to load (once) but it then stopped responding. Im not very keen on spending loads of money on another 8gb of ram from Kingston or Crucial if the same thing is going to happen, which I fully expect it will.
Thanks for the suggestions though, any other ideas?
Also worth mentioning that the ram that came with the laptop wasnt even Toshiba brand, it is Samsung ram so maybe they should make a list of all the compatible makes for their laptops or maybe not lock their bios's to the point that the end user is so limited.
+Message was edited by: Melchius+

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