New router, Daphile stuck on "waiting for Network Connection"

Been having a great time with Daphile at home, decided to set up a second machine and use my original one at work.

Have been using wired Ethernet connection as I initially had problems with wi-fi.

I took my original Daphile machine into work - it was well tested on my home network, but when I plugged it into my work router it failed to connect. The router setup web console doesn’t appear to see the Daphile machine either.

Tested the Ethernet cable/connection on another windows machine, all fine.

Tried booting from the install USB, it still got stuck at “waiting for network connection”.

Any ideas? Wondering if it might be an incorrect setting on my router…
 
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Yes, but he took it to the office and now it no longer works. It would be useful to determine whether it still works at home. (Disregard if it has already been retested at home and still works.)
Thanks, but I think it's highly unlikely that the issue is damage to ethernet socket. Nothing I can think of has happened to the machine that would cause it. Certainly I could take it home and try it again (and maybe I will) but I'm fairly confident I would be wasting my time.