Comcast RCA dcm425c cable modem won't hook to internet

SOURCE: RCA DCM425C

What it sounds like to me is that your router has been running for a while, and thus start to break down slowly. You coul try power cycling it.

power cycling:
1.) Only unplug the power cord from the modem only, for about one minute.
2.) After one minute has passed, plug the power cord back into the modem, give it a few seconds to boot up again, and it should work.

If the modem still does not work, then the problem might lie with the computer itself, very hard to see happen, but it could still happen.
If in then that case, you would have to system restore your computer to an earlier date. that it was working fine on.

SOURCE: I have the RCA DCM425C cable modem and also Vonage

You would connect from the output of the Vonage modem to the wireless router and then from the wireless router you can connect Ethernet to your desktop if you have one and then anything else can run off of the wireless.

or

get a wireless router / cable modem combo provided by companies such as netgear then you would connect the Vonage to the router through one of the available Ethernet ports and any other Ethernet connections to the router as well and anything else wireless would work wireless.

SOURCE: RCA Thomson digital cable modem internet light is

looking at the internal modem page.usually:192.168.100.1. on your browser.explorer works best for this look up. you dont need internet access for this. once inside you can look at signal strength coming from the street and signal going back. if its out of spec.then that needs to be corrected. Note :call your provider and ask for down/up stream
specifications. also weather or not your modem is ( EOL) End of life.
Good Luck.