Hi, I just had the exact same problem. Using raspivid killed the pi's network. So I connected it with a USB to my laptop which in theory outputs more power then my adapter and problem solved !

Yes it's defiantly a power problem ! I just had the exact same problem and I have been trying for hours to find out what the hell went wrong. Then I found your post and this one : http://www.raspberrypi.org/phpBB3/viewtopic.php?t=44329&p=353321 As everyone is saying it's the network that dies once y...