Hi,

>  We're using the same cable with the Sonicwall no problemo, we got a link
> light and the monowall web gui was showing it as being up.

you say you are using a switch....are you also using this switch with the Sonicwall?
If not, you may find that the switch needs to be correctly configured (if its
a managed device) - eg VLAN's, speed/duplex settings, ACLs, spanning-tree etc

alan