Ddr2 ram memory modules upgrade problem

pankajhwr

Right off the assembly line
My System Details are:
Processor: AMD Athlon (TM) 64X2 Dual core processor 3600+
Mother Board: ASUS M2N-MX
OS: Ubuntu 11.04 (Natty) X64 / Windows 7 X86
RAM: 512M DDR2 667 DIMM 5-5-5 (Transcend) X 2 Modules = 1 GB

I want to upgrade my system RAM by 1GB for that I have purchased new "1G DDR2 667 DIMM CL5 Transcend". When I fixed new module on motherboard then Windows 7 was working fine and showing all RAM capacity but when I started Ubuntu, the desktop was getting freeze after complete boot, I checked the new RAM module by removing both old 512MB modules and it was working fine on both OS. I want to configure all three modules on my motherboard. please help me to solve this problem.
thanks in advance.

Pankaj
 
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