Thanks for all you help with this board on the fourm
I was able to insall linux just only after setting the Corsair twin2x1024-5400c4 memory to 533mhz in the bios, I have also tried (675mhz 4-4-4-12 setting) and 400mhz no change in stablity. WORKED for the install

My problem now is that both windows and linux locks up after 10-15 min uses.

I have a 7 day to return part or all of my system. any thought. Can you suggest another system more stable? or maybe should I just try to return the KN9-sli for a new one.

Thanks for your time