My thanks in advance to all who reply.
I cannot connect to Xbox Live. Everything worked fine until a few days ago. I believe I have tried all the obvious solutions.
The main thing is that when I go to Test Connection, the console says "Wired / Wireless." I click "Wired." Now, the console is plugged into the router the same way it was a few days ago, when it was working. Only now, the console tells me it isn't plugged into anything.
The router and the cable have been tested. I successfully connected my netbook to the internet on the same cable and the same router. In fact, all the wireless equipment in my home works just fine.
I contacted Xbox live support, and they told me to send it in for repairs. I would REALLY prefer not to do that. Last time it was gone over two months. I would rather just buy a wireless card for the Xbox first.
Reading the forums, I noticed that answers to the following questions would help the community respond to my problem.
What Country/State/Province do you live in? North Carolina, United States
Modem brand & model number: Belkin N300
Router brand & model number: **** TM602G (I think. It was given by my ISP. This is what the modem says on the side.)
Network Connection Type: Wired
Things you have tried: Tested cable and router. Shut down and restarted Xbox, router, and modem.
Is UPnP Enabled? Yes
Is NAT Type Open? Unknown. Sorry.
Any Error Codes you encounter: No codes. It just says "To use a wired Internet connection, make sure an Ethernet cable is connected..." The cable is connected, I promise.
What type of internet do you have? Cable/DSL/T1/3G? Cable
Who is your ISP(Internet Service Provider)? Time Warner Cable
After you run "Test Xbox LIVE connection" and click on "More info", what is the exact message shown on screen? "To use a wired Internet connection, make sure an Ethernet cable is connected to both your console and your router or modem."
I am concerned that either (1) the ethernet port in the xbox must have broken or (2) some software change in my admittedly tempermental router has blocked access for some reason. Sadly, I cannot seem to figure out what could have gone wrong. I didn't drop my xbox or anything. There was a power outage about the time of this problem starting, but the Xbox wasn't on at the time, and it strikes me as unlikely that a power surge could have travelled along an ethernet cable to damage the Xbox.
As an aside, do you think connecting wirelessly would fix the problem? As I mentioned, I would rather buy a wireless card than wait two months plus have to pay for repairs. I mostly use Xbox Live for HuluPlus--is the wireless fast enough to support video like that?
Again, thanks to all who reply. I really appreciate the help.