I have the same issue - just installed 3.9 for the first time on a G5 yesterday. cant ping ip's on my lan. can ping localhost if i set a static ipadress. dhcp cant obtain ip address (netstat reports 0.0.0.0) have tried the above recommendations to no avail - please help!

[ Edited by ChrisMarsden 19.06.2016 - 11:27 ]