Installed Ram Computer Wont Boot

I recently bought a pair of "corsair 4gb (2 x 2gb) 240-pin ddr2 sdram ddr2 800 (pc2 6400) dual channel. " I'm upgrading from my 2gb ocz ddr2 ram from last year. So when i went to install the new ram, i took out the old ocz ram and put in the new corsairs. I started the computer but the monitor will not display anything! So i decided to move things around and i was finally able to boot the computer up after removing one of the ram sticks. It will not load with both and i have no idea why. It's really frustrating not being to load both since one is 2gb and the old ram were 2gb together. Also, the old ocz rams won't work anymore either. Can anyone help me on this please? How can i get both of my ram working together?

Here's some info on my computer:
Mobo : ecs g31t-m
Vidcard: xfx nvidia 8600gt
Two hdd 120gb & 250gb
One dvd-ram drive

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