Lost internet connection Linux Redhat

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http://unix.stackexchange.com – I have managed to lose the internet connection on a redhat linux server (it was able to connect to the internet previously). I'm thinking it dropped out after I entered the command 'service NetworkManager start'. Network manager was not running before (I was trying to work out how VPN can be configured on linux). I have since restarted the server, but still no internet connection. NetworkManager is stopped, but I'm thinking by starting it up before it might have changed something causing the internet connection to drop out. Any ideas of what I can try to find out the problem? As you might h (HowTos)