Network light won't even come on

[JuniorJr]

So, we have 10 of these. Hooked up 5 and that went fine. Hooked up the next 5, and the devices won't even light up their network LED. They're not even requesting an IP. My switch sees "life" but these devices just sit there. No ACK for IP. Tried to reset one of them. No change.
I would expect that the network light would at least start blinking while it sends a request for an IP.
Yes, it's 5 devices doing this, but I changed network cables anyway, changed network ports, used ports that work for the other 'working' devices, tried other devices in the switch to verify they get an IP from our DHCP, that works fine.
Any other ideas?
I've also brought one of these not working devices home to see if it would at least attempt to get an IP from my home network - it didn't even bother to request there either.
I've even removed one of the working devices, waited about 15 min, and tried one of the not working devices in case there was some kind of crazy limit of 5 of these on the same network. This is crazy.