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3 out of 4
3 out of 4
4 out of 4
And now you know why you are Admins and I'm not!
My 1 out of 4 just don't hack it! No matter how hard I complain, gripe, explain, cajole, yack!
What "switch?" Wouldn't want to use it around here, anyway, might hit the cat with it, ya know! 
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unplug the original modem and wait at least 20 minutes
It doesn't take that long to get another one from the store!
Have to admit, driving to the store and back does use more gasoline... 
Other things happened, also. I suspect that some of it was caused by my turning off at least half the circuit breakers in an attempt to install some lights in the attic that morning...never did figure out exactly which one controlled the light switch I wanted to tie them in to...
Anyway, after getting the modem working and surfing the interwebs, I decided to re-create my Comcast email account in Mail. Then I couldn't send with that account! As you may recall, at least a month ago, I was told that I could not send emails with Comcasts smtp server because I'd sent too many in 24 hours (even though I never used it for dozens of weeks/months!). That was when deleted the account, just to get rid of the "not connected" warning in Mail.
OK, since I was told I'd have to speak with "security" because of my 'infected' computer or my non-compliant behavior, I decided to start the 'tech support' call well in advance of the securities 5-day-a-week and only 9-to-5 work week/day (must be nice)!
I told the tech that the problem might be that I no longer knew for sure what password I had been using in Mail. My records indicated I'd changed it back in April, but being it had been near April Fool's day, I wasn't sure if it was still valid.
To make a long story short (unlike most of my posts!), after ~30 minutes on the phone, things were no better and I decided to simply delete the Comcast account, later! Ran some errands. Returned to find that now the Comcast account could send, but not the dot Mac!!
Magical!
Re-entered the dot Mac password and things are now back to 'normal?'