After everything was installed for the system with the X8DAL-i motherboard and the SC743TQ-665B chassis, I tried to power up the server. There is no sign of power. I replaced the PWS-665-PQ power supply already, but there still is no change.
Please check with the Supermicro tech support to see if your X8DAL-i motherboard had the latest ECO applied. If not, please send an RMA request to exchange the X8DAL-i motherboard for one with the latest ECO. This may be the motherboard's issue.