I know...and that's my problem. The ONLY A8N-SLI board I've been able to find (and I've been searching the web for hours) is a Deluxe model (not as good as the Premium) for $200.
This is the only mb out there that is new. You guys warned against buying a used one, so it seems new is the only way to go.
I figure it this way...the beeps said that the video adapter was at fault. Well, I guess not because removing/replacing the card(s) didn't make any difference. So if the new card creates the same problem, I've got to believe that it isn't the video hardware causing the problem. Meanwhile I have mb to keep in case this one goes nuts again - especially if I hand it down to my wife, which is what I did with the unit I'm using now.
But first, I'm going to call ASUS tech support and see what they tell me. The unit is no longer produced, I hope there will be some support.