Problem with Gigabyte GA-78LMT-UAB3 will only read 1 memory slot even with 2 sticks of ram

[jas173]

I have the above mb I install 2 sticks of ram and only 1 is read. if I take out one of the memory it will only read the one I left in. It does this on all 4 slots. If I pair up slot 4 and 1 the system sees one slot if I pair up 2 and 3 is see's 1 slot. If I pair 1 and 2 or 3 and 4 it will not boot. It reads the one memory stick that it see's correctly but only 1. It see's only one in the BIO's, in Windows, and in CPU-Z. I have tried 4 different pairs from other systems and they work ok. They all do the same thing in the G78LMT-UAB3. CPU-Z shows only a 1 channel setup. It seems that It is a single channel setup for some reason. How to get it to dual channel.

system:
MB----------------- GA-78LMY-USB3
CPU------------------ AMD AM3+ FX-4300
GRAPHICS--------- ATI Radeon 3000
PS--------------------- OCZ-600W
RAM------------------ G.SKILL F3-12800CL9D 8GBRL,1699 PC3 12800
OS--------------------WINDOWS 7

 

[Tradesman1]

Sounds like maybe a bad stick or the sticks aren't compatible