Does a laptop connected directly to the Ethernet connection in your shop work? If not, it's that cable. You can buy an inexpensive ethernet cable tester and verify. Otherwise you are saying that you...

I have a 8 port gigabit switch with 4 POE ports. It works for 2ea IP phones and it was serving the Access point this is replacing. It won't light up when connected to the POE switch. I've used...