It sounds like this is a new miner to you on this unit. I would check your router on connected devices and see if you see a IP there for it. You can use programs to scan, but logging into router is pretty solid method.
If you don't see it I would ask seller what they had the IP setting's on. They can tell you if you are looking for DHCP or a certain static IP. If you don't see it and seller is no help, know PSU works, good ethernet, etc. then you can look for a recovery SD card image. It appears no longer to be on SP site so might take some searching through forum.