Hi there, I have the ASRock N68C-S UCC motherboard, it supports ddr2 + ddr3 memory. Slot 1 and 3 are DDR2 and slots 2 and 4 are DDR3. Slots 2,3 & 4 aren't working. I was running on 2 gigs (2x1Gb) of ddr2 kingston memory. I got a BSOD and the PC shut down, then it didnt post. I made a research and I saw some things I can do about it. When i removed the RAM from slot 3, the system posted. I thought only slot 3 wasnt working, so i got 4 gigs (2x2Gb) of Corsair ValueSelect memory. But when I installed them the system didnt post. I tried to use only 1 stick of 2Gb ddr3, but it didnt post either. So only slot 1 is working. What can it be ? Is it the motherboard or what ?