First off there is no need to use the BellSouth CD. All they do is add advertising crap. And AOL is no better.
Your computer drivers are here from Dell:
http://support.dell.com/support/topi...NT_P4_CEL_2400
Safe Mode with networking just means you can go online in safe mode. Of course if BellSouth is not connecting it won't matter.
Can you not find another computer to download and burn these drivers?
If not just try setting up your BellSouth connection manually. You do not need their CD.
Click > START > Connect To > Show all connections > Create a new connection > Connect to the internet > Setup connection manually > Connect using a broadband connection / password / etc.
If you get this far then you insert your BellSouth ID and Password etc.
If it really is a monitor issue try another monitor. Is this monitor a CRT? Did it come with the computer? Do you know if it ever worked?