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Well what I'm guessing the cause of your problem might be is because of the RAM. What is the model of your RAM? You can check it by either opening up your computer, while it is off, take out the RAM, and checking the model on the manufacturer's sticker. Or you can also downloading a program called CPU-Z and going to the Memory tab. That is if you're not comfortable about opening up your computer case. And don't mind about your long posts, we don't have much of these kind of posts that actually list the whole problem.