Sorry it has taken so long to get back to you. Since it worked at 100 FDX it went to the bottom of my list of problems to solve. I did however find time to look at it earlier this week and your thoughts were right on the money. It still did not work at 1000 FDX between a PC and the 24 port switch on a known good port. I replaced the connectors twice at each end of the cable with no improvment so I finally bit the bullet and snaked another cable. The new cable worked right out of the gate with the first connectors that I attached. Thanks for your help.
As an aside, I am not sure what is up with this site but it would not let me login and when I asked for a new password it said the email address was good but I never received a new password even after 24 hours. After several attempts with the same result, I finally gave up and registered with a different email address and username.