[wellylug] switch / howto

[E.Chalaron]

Hi there
I just got a 3com managed switch here, worked fine til I stopped a couple of 
machines, swapped a couple of disks and TV cards and usb stuff.
bootted back the all of them without complaining but NFS...

Now I want to ping my network to see what is available .... host 
unreachable... from all the machines...

got my old hub back into place : everything works.
Turned off the switch move the eth cable to it, turn it on ... zouch / nada / 
nothing..
Anything I missed ??? or I messed ?
Thanks a lot
E