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Visit http://netgear.com/support , put in your model number, and look for Documentation. Get the User Manual. Read. Look for "Troubleshooting".
If you still have problems, then you might return here with some kind of description of your equipment other than the R6120 (Modem? Computer? ...?), and some kind of symptom description more detailed than "stopped". As usual, showing actual actions with their actual results (error messages, LED indicators, ...) can be more helpful than vague descriptions or interpretations.
My car stopped. What do you think that the problem is?
You are correct and I have trouble-shot until my eyes are bloodshot. So, here is a more descriptive idea of the problem. I have plugged everything in properly and followed all of the instructions as well as I can. I ran the wizard and all 4 LED lights went green, indicating that all was well, until at the end of the wizard when it began running a firmware update and the internet light turned red again. I do not have a modem and was told that I could plug the router into the wall and it would work just fine, yet I can't get it to work and even went out and bought another router, a C3700 that I now realize I can't even use for this purpose, because I don't have cable TV. I really don't know what else to say, but I am at a great loss for where to go next.
Not a useful description of anything. Cables get plugged into things. A cable has two ends. I don't know what your "everything" is, and I have no reason to believe that you know what "properly" is. It's nice that you're happy, but that's not the same as a useful description.
> [...] followed all of the instructions [...]
Even if I knew which "the instructions" you meant, I still wouldn't know what you actually did.
> [...] it began running a firmware update and the internet light turned > red again. [...]
And then what happened? What are the LED indicators indicating now? Did the firmware update fail? Try to bear in mind that the non-psychics in your audience can't see what you see, what you do, or what happens when you do it. If you can't describe these things, then you may need to seek local expertise.
> [...] I do not have a modem and was told that I could plug the router > into the wall and it would work just fine, [...]
Possible, but I know nothing about your Internet service, including what's beyond your "the wall".
> [...] went out and bought another router, a C3700 that I now realize I > can't even use for this purpose, because I don't have cable TV. [...]
Yup. If you have an Ethernet port in "the wall", then a cable-TV modem+router is not what you need.
