Memory troubles

I would like to think of myself as an experienced system builder as I've built many in my time.

However I have come unstuck with an error code that I came accross today.

I have an Abit IP35 Pro Motherboard with 4 slots in it. I have had, for the past 2 years, 2 x 1gb sticks of PC2-6400 OCZ platinumx sticks in there, without any problems. I wanted to upgrade to 4GB of RAM, using all the slots I have, I bought another identical pair of modules.

Upon installation, I had my original pair, lets call them A1 and A2 installed in matching DIMM trays. I installed my new pair (B1 and B2) into the remaining two slots.

Upon installing them, the computer did not boot, it hung on error code 52. I checked this code and it says:

Code:

Test all memory (clear all extended memory to 0)

Fig 1. Original config

Code:

Slot 1 =============== A1
Slot 2 -------------------
Slot 3 =============== A2
Slot 4 -------------------

Fig 2. Installation of new memory - resulting in error 52

Code:

Slot 1 =============== A1
Slot 2 =============== B1
Slot 3 =============== A2
Slot 4 =============== B2

So i decided to take out all the memory and put my old memory in the other slots to see if it was a problem with the slot.

Fig 3. re-installation of old memory

Code:

Slot 1 -------------------
Slot 2 =============== A1
Slot 3 -------------------
Slot 4 =============== A2

And this worked fine - booted with no problems. So I took the old memory out, put the new memory in, on it's own in both pairs of slots and it still worked fine.

Code:

Slot 1 ------------------- 
Slot 2 =============== B1
Slot 3 ------------------- 
Slot 4 =============== B2

Slot 1 =============== B1
Slot 2 ------------------- 
Slot 3 =============== B2
Slot 4 ------------------- 

So finally I tried the memory round in the only remaining configuration there is and it would not boot.

Code:

Slot 1 =============== B1
Slot 2 =============== A1
Slot 3 =============== B2
Slot 4 =============== A2

As this proved unsuccessful, I have had to turn to you guys for help. Does anyone have any Ideas? I have cleared by BIOS and it did not do anything.

Thanks in advance.
Supra

 

sounds like a memory controller issue to me, doesn't like all 4 dimms filled. have you updated to the latest bios revision?