Bare with me. I took over the task of cameraman for my community. I video board of director meetings for 3 things, stream live over local cable channel, stream live via ustream, record and schedule for later viewing on local cable channel and youtube for on-demand viewing. Lots of pressure at show time.

Basically, I learned a task and have been following it religiously for 2 years with good results. I have a programmer background, not much networking experience...

Using Vidblaster, 2 laptops - 1 for Vidblaster the other for camera control, a couple webcams hooked up to a Cisco switch (Catalyst 2960) and plugging the switch into the wall/network enables me to get it done. Beyond the wall, let's say I'm learning the hard way.

Ok, now the problem/mystery...

Since I started doing this, the switch port used to cable to the wall/network port came up with a 'green' light, along with the other switch ports used by the other devices hanging off it, those being the 2 webcams and 2 pcs, so a total of 5 green lights on the switch. These were always the results from the 2 locations where we hold board meetings. Then one day, the switch to network port comes up 'yellow' from one and only one of the two locations, the other site...still all 'green'?

From the troubled location I find, a pc plugged into the same wall/network port seems to work fine, we have network access, verified via functioning internet access. However, the switch does not, and the devices hooked up do not reach the internet either.

Where is a good place to begin an investigation into why this one port does not like the switch?

Is it the switch? Cables I've ruled out. Is it the network? The physical wall ethernet port itself? Will ipconfigs point to it? Anything to get me started...

Many thanks in advance.

Charlie