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06 Jan 2011  

Microsoft Community Contributor Award Recipient

Windows 7 64 Bit Home Premium SP1

It sounds like mismatched RAM or bad RAM sticks.
Have you run Memtest86+ on the RAM? You can run a test on each stick in the first slot to test each stick individually, then run a test with more slots populated.

I was going to jump right to a defective motherboard, but now you say you ran 8GB previously, so I'm leaning more towards mismatched RAM.

FYI: if the system freezes during BOOT before the hard drives are found then the OS has not been loaded and cannot be a cause of the problem.
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