network icon says connected but no ping

Hello

I have been searching for awhile now on the net. I am pretty sure this must be as simple as .. but cannot seem to solve my way out by myself :)

I have had internet access (not configured by myself though) on our server with 4 network cards. For some reason I took of the network cable (just one was plugged in) since then I have not been able to connect to internet again. On the desktop I have tried to disconnect the 3 of the 4 networkcard. I have setup both static and dhcp on eth 0. When dhcp it will not connect, with static ip configured through desktop gui it states: connected - but I cannot ping either internal nor external ip adresses - what is wrong (using fedora 12 but planning to go to latest version when up and running again) ?

Thanks
Danny