Thanks to both of you. That's what I figured. The motherboards are identical; both were bought for HTPC applications and built about the same time. The 'good' one has already been installed in a Fractal Designs Core 500 case and everything works just fine. Both HTPCs were built in a very small Lian Li case and once it's built you hope that it runs without problems as you have to pull everything out to trouble shoot. I just wanted to minimize down time on the switch over so I don't miss any television programs.