Did you make sure you called up Time Warner so they could activate the new modem?
You can’t simply plug in a different modem on a whim and see if it works the Cable Co. has to activate it.
Yes, it was their modem I switched it out for. I called them after I pluged it in and they sent the test signal and still could not pic up my modem.
I’m confused when they say that because I had no problem getting the cable TV reception thru the same outlet.