Tony, sorry but: do you know we are faaaaaaar from your server, desktop, screen and you are asking for help without any kind of useful info? 
1) what version of SME?
2) what kernel?
3) what about errors in the logs? (dmesg and /var/log/messages)
4) what about opening a bug in bugzilla as suggested when you wrote this post? 
Stefano
Hello Heckler I see you found some more people in the forums to annoy,
Paperguides-
Hi, I will work hard to try and help on this topic.
Listen to wires12 that should help, if you can login to the console from the server, or remotely using ssh or putty, then access the console from the terminal by going to (ssh admin@yourdomain.com) and you can select option #2 (configure this server) as wires12 has suggested and then you can re-configure your network cards from there
If you can not login remotely then you'll have access the server directly from the keyboard attached to the server itself, and login as (admin), and (yourpasswork) this will open your SME console window to access option #2 (configure this server)
If none of this helps then if you could be so kind as to post your setup such as:
1.Are you setup as a Server Mode Only (one network card)
2.Are you setup as a Gateway Mode (meaning 2 network cards installed)
Anyhow any information you can provide on your setup; and I would be most happy to provide the best customer care available.
Thank you for using SME
P.S
It is greatly appreciated that you post any bugs in the bug tracker in order for SME persons to address this topic in their programming or documentation.