It can be due to many things. Incorrectly installed procesor or cooler, bent pin on motherboard or processor etc. Check for those first, reinstall the components absolutely in correct way. Then check if dual channel works or not. If not update the BIOS (assuming you haven't already). If any other problem arise or the problem persists, head back here with update.
Also I'm curious about the version of your RAM, is it 4.32 or something else?