Just to add I'm in a similar situation, I'll explain.
I have installed 4GB of RAM (2x2GB) in slots A1 & B1 as per the manual, but the Bios & OS using Windows 7 64bit only sees "1.99 GB Usable."
The manual says I can only use either A1 OR B1 to boot, so I tried slot A1 on it’s own and the system boots showing 2GB of RAM in the Bios & Windows - Correct, so now if I use B1 on it’s own the system will not boot up with any 4 sticks of RAM I try using - I get AMI BIOS POST CODE: EA which isn't in the Manual to explain what’s wrong – the RAM works perfectly in another system by the way.
Now if I populate all 4 RAM DIMM slots 8GB of RAM (4 x2GB) I have 4GB out of 8GB show in Bios & Windows.
I then began to switch out RAM & found that if I put RAM in slots A1 & A2 - 4GB of RAM (2x2GB) I have 4GB of RAM show correctly, but using slots B1 & B2 fail to show any RAM, so it must be the two faulty DIMM slots out of a process of elimination.
I did some more investigating of this problem & it seems that the issue can arise to misaligned pins, bent pins, missing pins on the socket.
Upon close inspection of the socket this is what I found, all the other pins are totally fine nothing wrong.
I've stated this in my RMA which has been recieved back today to where I purchased, I will let you know the outcome but I'm not very confident.
I'm really really worried that a Novatech Tech/Engineer will just say "ahhh end-user damage, warranty not covered" because Scan & Ebuyer have done this with customers I have looked it up! OcUK have replaced. (
omg amazed!!)
With the amount of exact same problems arising I think theirs more to it than it seems, I'll probally take further action if that is the outcome as I simply cannot afford to replace the motherboard.