Um...guys, read the post... Chances are, when you removed the cable line from the old splitter, you probably damaged the connection on the F-connector going to the third TV
I redone the all the connections going into the splitter..
he already did that. Read the post.
My only ideas are that as mentioned, you might have plugged the out (to TV 3) to the in on the splitter (should be the feed from Cable Co) or maybe you should re-re-terminate the TV 3's F-connector.
Also, the infamous cable modem could be causing problems.
edited to add... Oh crap, nevermind guys, I have to start looking at these post dates. I'm used to forums where 3 pages will be from the past 24 hours. I'll fix that. My apologies.