I have two servers one running a SE7520BD2SCSI and one running a SE7520BD2SATA both have been running a SL7PH 3.6GH processor in CPU1. We ordered upgrade kits with matched pairs of 3.6GH processors. Neither server will post with two processors. They run fine with 1 but not two. Each of the individual processors will post on either board. The pairs have the same stepping, cache etc. What am I missing? When I power up the boards the diganostics LED all turn on and stay on never changing.