I am rebuilding 2 units. Neither replacement board has the cpu installed. My issue is that my existing chips seem to fall into the 423 socket incorrectly. The chip is supposed to have ONE beveled edge and ONE marking to align with pin 1 of the socket. In my case the chip falls into the socket only in one orientation, apparently incorrectly. It is oriented 45 degrees AWAY from pin 1. Please provide me with details as to the markings on the chip and socket. There is NO video. I have replaced cards, reinstalled OS. no change. I think the chip installation has something to do with this issue. Photos would help or a quality drawing. Thanks. Move as needed.