My Book World Edition NAS server not accessible


I kind of just bought a new nas server, but I had som trouble. Sometimes it was accessable and sometimes not.

As stupid as i was i tried to fix it myself end up with me change some options. What i changed was some mode in the network thing. I changed it from DHCP to Static, because i thought that it would make the server not change ip and will keep be accessable all the time. But ofcourse it didn’t go so well, now i cant access anything, even though i restart and restart and change ethernetcables… I’ve tried with everything what should i do? Please help…