os & bios does not recognize memory correctly

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http://serverfault.com – I'm having problem with my PC. for some reason my os & bios does not recognize the memory correctly. it used to recognize it though. I have 12gb but only 8gb recognized. I have rampage III motherboard which supports up to 24gb. I use CPU-Z to verify it, and it shows 12gb for the memory. any ideas? TIA (HowTos)