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I bought and placed an additional 2GB of RAM in my notebook. I went to the setup screen, and appears there, I added the memory (2GB + 2GB = 4GB).

When I continued to boot the notebook, the screen indicated that Windows 7 was loading, but before the operating system finished loading, a blue screen showedd, which suggested to me that the new memory was not working (somehow).

I then used only the new RAM modules in my PC and to my surprise it worked again, which leads me to believe that the conflict was between the different memory sticks.

How can I be 100% sure about that?

Edit 1: The blue screen message is:

A problem has been detected and Windwos has beed shutdown ...


Technical Information:

STOP: 0x00000000A (0x0000000000000000, 0x0000000000000002, xFFFFF8000C0CA869)

Edit 2:

My Windows is 64 bits, this influences into something?

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Will your laptop accept 4GB of RAM? Try swapping the RAM between sockets. – BJ292 May 18 '12 at 21:42
What did the blue-screen stop message say? – user3463 May 18 '12 at 22:08
blue-screen stop message don't say nothing useful, just: IRQL_LESS_OR_EQUAL – Richard May 18 '12 at 22:21
Yes, my laptop accept 4GB of RAM... And i already try to swap the RAM between sockets. – Richard May 18 '12 at 22:21
Do they provide you with manuel ram settings in the bios? If they did you could try and tweak the timings , lower the divisor , get it functional, test it then, to be sure , then tune the timings completely. The stop message screen is (sorta) useful, indicates some driver thing usually. A "resource" allocation thing for a hardware driver, getting a minor memory errors might toss that error. If you can not adjust the ram, then your going to have to get ram that is on the "compatability list" Or just different – Psycogeek May 19 '12 at 4:08

A possible way to assert that you have purchased compatible memory chips involves looking up the specifications sheet (manual) of the laptop and checking that the memory modules are listed there.

You should also verify that the ram modules are configured to run at the same frequency. Alternatively, verify that the motherboard is capable of running modules with different speeds.

On the other hand, it may be a good idea to start troubleshooting the ram modules by booting a tool such as memtest86+. After performing the test, at least you will know that the chips are not spoiled. Search for this tool on superuser if you have questions.

Since the error occurs when the OS is booted with more memory than configured by the vendor, a (less then well informed) guess would be that windows rejects the new hardware configuration because it does not conform to the OEM licence. I'm not very knowledgeable on this subject, but in the past, I have "broken" a windows OS by moving the HDD to a new motherboard. If you care to get informed about these restrictions, start by reading this document.

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I'm unable to give a more decisive answer because the question omits information such as models of the ram modules and the motherboard. – Ярослав Рахматуллин Jul 20 '13 at 12:48

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