Internet issues....

I am not an IT guy and I don't play one on TV.  I didn't even stay at a [famous name] motel last night.   The internet should be an appliance like cable TV.  It should just work and I shouldn't have to worry about it.   But for the sake of peace in the home, I have to be.

The SandCastle is back online with the back (old) DSL router.  The very one that quit a few months ago and was then replaced.  Now the new one won't connect to the internet.

Seems to me the problem has to be with the modem.  The DSL service has to be OK if one modem works and the other doesn't.  Same goes for getting into the model (192.168.0.1).  Works on one (sometimes), but not the other.

We already traded in the "new" modem once, so I'm at a loss.  Is the current model just a turkey?  Time to try another make?

Someone suggested could be a power supply getting flakey.  Good suggestion but I don't think so.  I'm tried each power supply with each modem and the problem follows the modem.  I think we'll try a different manufacturer next time.

Got any suggestions?  I'm open!