Hi Bert,
Have you been talking to my wife? She too wondered if it wouldn't pay to bring someone else in! One of my retired patients had 200 IT guys working for him at the Federal Reserve Board and was great when I ran into a problem, but he moved to NC last year. I have another fellow I can call, but he's in China for 3 months. I've had other "experts" work on a computer for hours without results, hence my trying to "Get by with a little help from my friends"; that would be you folks. I just knew there had to be a simple solution, and fortunately I finally figured it out. I've always enjoyed challenges such as the pheo I diagnosed last week, road rallies, and alpine climbing, but I must confess that this computer mystery was almost going from the sublime to the ridiculous.
The desktops all have 1Gbs cards, including the main computer. It is the Actiontec 784 wireless DSL modem that is 100Mps.
As far as the plenum cable is concerned, I come from a family of electricians, spent a couple of years in the IBEW between college and med school, and I always insisted on doing things the right way, according to code.
Thanks again for your help. Look me up if you ever get to Vail.
Norm