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RAM compatability with Motherboard - not posting in Dual Channel Setup

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http://superuser.com – I have a problem in installing 2 DIMMS of G.SKill memory in my motherboard. To start with, Motherboard is http://www.msi.com/product/mb/KA790GX.html#/?div=Detail and the RAM is http://geizhals.at/de/g-skill-dimm-kit-4gb-pc2-8000u-cl5-5-5-15-ddr2-100... The scenario is like this... The RAM works in Single Channel mode, installed on Dimm 0 and 3. But as soon as I try to install it on Dimm 0 and Dimm 1 (for Dual Channel) it simple do not POST, just the CPU Fan powerup but no signal on screen. Additional Tips BIOS is flashed to the latest version. I tested with (HowTos)