Broadband dies

Yesterday I powered up trusty desktop and oops, "Network Cable disconnected" said Windows, and sure enough, no Internet. I looked in the rats nest of cables behind the computer, and the network cable was plugged in and the green LED was glowing. Huh? How come Windows says the cable is unplugged when the LED says it is plugged in?
So I wiggled some cables and started up the hardware troubleshooter program and bingo, the cable became connected, Internet returned, and I could read my email. This lasted for about an hour and then that pesky cable popped out and the Internet went away.
After a while the urge to get on line became irresistible. Maybe it's something wrong with trusty disktop? I pulled antique laptop out of its carry case, unpacked, unrolled, and plugged in the power pack and the mouse, and booted antique up. She was unable to find the house wireless router signal. Argh. Must be something wrong with the broadband.
Maybe that flaky router is finally dying? Router will lock up and refuse to connect until it gets "reset" actually I pull his plug out of the wall for the count of ten, then plug him in again. And, believe it or not, I have a spare router, just lying around the house. So I swap out the router, see the new router's LEDS light up, and go back up stairs to my computer farm. No luck. No Internet.
Well maybe Comcast is down? That happens now and then. So the rest of the day goes by, I go to bed, and next morning, bright eyed and bushy tailed, I try for Internet. No dice. Windows still thinks the cable is unplugged. Just to be sure I look at the cable again, it's plugged in, but the LED that was glowing green the day before is out. I inspect the router, and notice, the router ain't showing any lights either. I check the wall wart that powers the router and AHAH, it ain't giving out 12 volts like it ought to. It's showing a measly 2.46 volts DC on my new-to-me B&K DMM.
I rummage in my junk box, and wonder of wonders, I have another 12 volt wall wart, and it still works. And the plug matches! So I put the backup wall wart to work, and lo and behold, Internet returns.
Anyhow, that's why no post on Saturday. (Is that a Harry Potter line?)