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It sounds to me like it could be bad RAM. Try this. Take out every stick of RAM. Then put in one stick of the 'new' stuff. Then try to boot. Do this for each stick. If you get one stick that it won't boot with, then thats the bad one.
It could also be that the new RAM and the old RAM are incompatible, or that the new stuff is incompatible with the motherboard. Some mobos are picky about the RAM that they will run on.