|"Or is it because the computer senses a poor graphics monitor is connected by RCA cable and therefore won't even allow internet access?"|
Sorry but I have to LOL.
The monitor has nothing to do with your internet access. For us to trouble shoot the problem you need to go to your Command Prompt and run the following command...
IPCONFIG /ALL > MYCONFIG.TXT
Then go to your My Documents and open the newly created MYCONFIG.TXT copy what is there and post it in the forum.