STR DN1020 problem with connection to network

[Maslan]

My STR DN1020 cannot join to network. I reset my router and reset factory settings on my STR DN1020 and i have still that problems. there is no connection because i cannot play song from my laptop on STR DN1020. Dlna not working. when i saw in router there is no ip of STR DN1020 but led indicator of lan when STR DN1020 is plugged is lighting. I dont know where is problem