open your motherboard manual and read
there are two pages of codes and it explains what each one stands for
"Error code 0x53: Memory initialization error. No usable memory detected."
Why would ASRock post Kingston KHX1600C9D3K2/8GX memory as compatible if the motherboard won't detect it? http://www.asrock.com/mb/memory.us.asp?Model=P67%20Extreme4%20Gen3
And since it won't detect it, does that mean there's something wrong with the memory or the motherboard?