Asus M4A79XTD EVO issue! Memory slots behave strangely!

Hi,
This is the first time I'm writing here. Recently, I encountered an astonishing problem. I'm completely dumbfounded and clueless. So any help is greatly appreciated. Now, the issue: Whenever I install RAM in DIMM B1&B2 the system doesn't boot up. I tried other RAMs and nothing changed. This problem occured suddenly. I mean I was working with computer and next time I turned it on, computer stopped working. Here is what I have done so far: 1) update BIOS 2) nearly every single steps in this topic : http://www.tomshardware.com/forum/294166-30-asus-m4a79xtd-computer-doesnt-boot-sticks-installed
Thanks in advance,

 

First of all, How old is this Motherboard ? It is either the wrong ram or the ram slots are bad..How long has it been doing this?

 

Thanks for reply,
My mobo is 3 year old. Its being like this for a week.

 

What make / brand is your motherboard???

 

Look at the title! At the top!

 

sorry about that, not much sleep last night.. Sounds like the Motherboard is going bad..

 

Does it work if you use the other RAM slots?