I lost all signal last Saturday. TV, internet, and phone.
I checked with one of my neighbors to be sure it wasn't a system outage...then called Comcast. They ran some tests from their end and said, "Yes, it appears your system is not functioning."
No shit...
I don't trust my neighbors. They're the worst neighbors we've had in 36 years of marriage. We were glad when they moved out 2 years ago and rented the house...to the nicest neighbors who've lived in that house in the 12 years we lived here. We were sad to see them leave the first of the month...I noticed the neighbor looking at me kind of funny when I came back from talking to the other neighbor and calling Comcast. They've been caught stealing cable before...I noticed that the lid for the outside cable box looked...odd. The lid for the outside box doesn't fit right...grass is tall, lid just sits on top. Technically, it's on the "bad neighbor's side of the property line, but is next to my driveway...So, I grabbed a flashlight and looked...sure enough, the cable was broken where it attached to the tap. No sign of anything else...no splitters or any odd connections to indicate that they had tried to connect to my service.
I dug in my box of misc. electrical junk, found an old crimp-on co-ax end...and put it on...Voila! I had connection.
So...I called Comcast on Sunday, got connected to India...explained the problem, what I found, and what I did. "Oh, there is being no problems. Ve vill still be sending a technician at no charge to you." :hmm:
Monday, Comcast called me again (local dispatcher) to make sure we were still on for the tech appointment. I said yes, and explained again what I had found, and what I had done. The India tech support guy hadn't even made notes.

The tech showed up ON TIME, I explained what was going on, gave him the parts I had replaced. He made a phone call to Comcast, verified that the neighbors had indeed once been disconnected for stealing cable, then went to work.
He cut off my mickey-mouse repair, replaced it with a new-style end, hooked up his meter to the system, ran some tests...and told me that this was Comcast's problem...and that I wouldn't be charged for the service call.
So far, it hasn't shown up on the bill. <knock wood>