Cant use both RAM slots, Asus M2N68

Helloes

Simply, the computer doesnt post at all if I fill both ram slots on an Asus M2N68 AM+ board.

Ive tried 2 different pairs of ram (2x 2GB Samsung 800mhz CL6, 2x 1GB Corsair xms2 800mhz CL5) which both work in another computer.
Both of those pairs of ram are in the asus QVL so they *should* work :|.
Ive also tried 3 different PSUs just to be sure, dont have any other ddr2 ram to try.

I have updated bios to latest, dont recall version atm, Ive set the timings/clocks/voltages for each ram pair in the bios just to be sure.

Havent got a clue what to try next :[

Asus M2N68 AM+, 4gb Samsung 800mhz/cl6 OR 2gb Corsair 800mhz/cl5, Amd Athlon X2 2.8ghz, Sapphire 5670, Corsair VX 550W (also tried hx 850w/hx 1000w)
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More about cant slots asus m2n68
  1. Just treat this as a new build and perform the step-by-step debugging procedure per http://www.tomshardware.com/forum/261145-31-perform-steps-posting-boot-video-problems
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