I have no experience w/ an open box mobo, but I figured I would share my opinion anyways :-). Of all compenents, I wouldn't buy an open box mobo for two reasons. First, it has a thousand different chips on it, nb, sb, sata, memory controller, etc. so if any one of those things failed it's out. Second, why would someone open a motherboard up, look at it, and send it back......if you don't need it, you're not going to open it. I find it more likely that something malfunctioned and they just sent it back without reporting it. Use your own judgement.