Hi, when you say you interchanged them, do you mean you removed one and just tried to boot up with one of them at a time? If not, maybe you should try that before returning the motherboard. Did you say you know the CPU is good? Mandi jimi moore wrote: > I just have two 2048 matching ram sticks and have interchanged them a > few times. I haven't pulled the cpu yet so I may try that. I have > replaced cpu's before and I think I got the paste on right but who > knows. It just acts like the mb is dead. > > Thanks, > > jimi > > Visit our website regularly for FAQs, articles, how-to's, tech tips and much more http://freepctech.com