The guy or girl sold you faulty motherboards I would recommend just buying either a new computer or building one to save you alot of time money and trouble.
i really appreciate all the time you have put into this to help me out. i'm 47 & fully Disabled & my funds are limited. I did order a new board for $50.00. If i were to build a PC it would be about 2000GHZ. But speed isn't everything!