Why can't I boot up NAS-3200/3400/5400 successfully?

You need at least one un-partitioned hard disk to boot the servers. When such an issue occurs, check if there is a hard disk installed on the server. If not, install the hard disk onto the server and then reboot it. Moreover, all hard disks applied to NAS servers must be configured in "Master" mode. You can refer to the jumper settings printed on the hard disk.