Hey you guys are right. The problem was with the mobo socket,
I took my proccy out of mobo today. To check the cpu socket. What i found was a bent pin.
I carefully made the pin straight. Now all four ram slots working fine.
No i am running my rams on slot a1 and b1 :D.
Thanks a lot guys.
For everyone who planing to buy Asrock z77 Extreme :
I searched online everyhwere. Many reporting that mobo having faulty ram slots. So beware.
I took my proccy out of mobo today. To check the cpu socket. What i found was a bent pin.
I carefully made the pin straight. Now all four ram slots working fine.
No i am running my rams on slot a1 and b1 :D.
Thanks a lot guys.
For everyone who planing to buy Asrock z77 Extreme :
I searched online everyhwere. Many reporting that mobo having faulty ram slots. So beware.
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http://www.asrock.com/support/faq.asp?id=334