Have you tried other memory sticks on your motherboard, or your new corsairs on another motherboard? What's your exact mobo and memory btw, there could be an incompatibility.
Ok, so your memory sticks should be compatible with your mobo. Have you tried my previous suggestions? You can also move the sticks around (place the sticks of your CORSAIR set into different slots), and see if that fixes things.
Any updates telnet05? I also realized that CPU-Z may not see your extra 2GB because you might running on a 32-bit OS like Windows. Could be wrong though.
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