Internet connection not working: don't know how to change network settings

I have a Macbook Pro with an internet connection that normally works fine. However, in my apartment, we are provided with a cable modem that has only one ethernet cable hook-up. Since we needed atleast two ethernet connections for two computers, we bought a switch that we hooked into the cable modem to give us extra ethernet ports.
Recently, while hooking up my ethernet cord to the switch, I have not been able to connect to the internet. Network Diagnostics tells me my Built-in Ethernet is working correctly, but Network Settings are at yellow, and my ISP, Internet and Server have all failed. I have followed all instructions to check my connections, and restart the modem, switch and computer many, many times but there is no problem with any of these things. The other computer connects fine on the switch and cable modem.
Additionally, under Network in System Preferences, I am being shown that there is an IP address and Subnet mask, so I am assuming there is nothing wrong with the cord, modem or switch (which work fine on the other computer), but there is no Router number, which seems odd. If it helps narrow things down, I am also trying to connect to the internet via DHCP rather than PPPoE, which is what I normally use.
I am guessing I must have accidentally changed something to do with my network settings and it is not adapting to the cable modem any longer. Unfortunately, I do not know how to do this, nor what to change it to if I had to. My landlady knows nothing about what kind of network settings I need to connect to the internet service provider. Other than calling Time Warner Cable (who provides the cable modem with ethernet hook-up)is there anything else I can do or should be considering in order to get my internet connection working?

heather1688 wrote:
Recently, while hooking up my ethernet cord to the switch, I have not been able to connect to the internet. Network Diagnostics tells me my Built-in Ethernet is working correctly, but Network Settings are at yellow, and my ISP, +*_Internet and Server have all failed_*+.
I am having this problem if you find a fix please let me know. I have spent hours with apple trying to fix this. Im going on my third week with apple trying to fix this and i have a thread on this issue.
http://discussions.apple.com/thread.jspa?threadID=2104335&tstart=0

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