motherboards are almost always going to be mounted on the right side of a tower (facing left) or facing up in a sff/nuc/laptop. if all else fails, look at the i

motherboards are almost always going to be mounted on the right side of a tower (facing left) or facing up in a sff/nuc/laptop. if all else fails, look at the io shield. the side where all the ports line up is where the io ports are attached to the motherboard.