Originally Posted by maxsanders
The computers in question are not on the same network switch. How does that work? Cannot one computer downstream one switch communicate with every computer on the network for normal traffic (assuming file sharing and subnet are appropriate) ? Thanks!
Yes. I asked because in this case it sounds like either the DHCP or TFTP exchanges between the clients and the server aren't getting through, so there may be something wrong with an intervening cable or device - DHCP is a pretty basic protocol.
It's definitely worth trying a nonworking computer on the same switch and network cable as the one that works, to eliminate the possibility that the problem is network hardware. If that doesn't work then you have at least narrowed it down to being something that is particular to the client PC itself.