Linux network connection not found

When I install fedora 9 I was able to connect to internet without any problem. But when I set my LAN ip to be a static one over the LAN, I wanted to manually activate the network device,as automatically it was inactivate.

I was able to solve the problem by runnig following commands,

/sbin/chkconfig --levels 345 NetworkManager off

/sbin/chkconfig --levels 345 network on

After u run above commands, network manager icon will not be displayed any longer.